diff --git a/README.md b/README.md
index 87621ef67..f0d3abc5c 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ Sky Walking
 SkyWalking: Large-Scale Distributed Systems Tracing Infrastructure, also known Distributed Tracer.
 
 [![Build Status](https://travis-ci.org/wu-sheng/sky-walking.svg?branch=master)](https://travis-ci.org/wu-sheng/sky-walking)
+[![Coverage Status](https://coveralls.io/repos/github/wu-sheng/sky-walking/badge.svg?branch=master)](https://coveralls.io/github/wu-sheng/sky-walking?branch=master)
 ![license](https://img.shields.io/aur/license/yaourt.svg)
 [![codebeat badge](https://codebeat.co/badges/579e4dce-1dc7-4f32-a163-c164eafa1335)](https://codebeat.co/projects/github-com-wu-sheng-sky-walking)
 [![Join the chat at https://gitter.im/sky-walking/Lobby](https://badges.gitter.im/sky-walking/Lobby.svg)](https://gitter.im/sky-walking/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/LogData.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/LogData.java
index b50468bdc..1bc7c8f3c 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/LogData.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/LogData.java
@@ -12,14 +12,14 @@ import java.util.Map;
  */
 public class LogData {
     @Expose
-    @SerializedName(value="ti")
+    @SerializedName(value="tm")
     private long time;
 
     @Expose
     @SerializedName(value="fi")
-    private Map<String, ?> fields;
+    private Map<String, String> fields;
 
-    LogData(long time, Map<String, ?> fields) {
+    LogData(long time, Map<String, String> fields) {
         this.time = time;
         if(fields == null){
             throw new NullPointerException();
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/SegmentsMessage.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/SegmentsMessage.java
index cc2fc2bc9..ca34b1180 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/SegmentsMessage.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/SegmentsMessage.java
@@ -1,6 +1,5 @@
 package com.a.eye.skywalking.trace;
 
-import com.a.eye.skywalking.trace.TraceId.PropagatedTraceId;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.TypeAdapter;
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/Span.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/Span.java
index 57573fd4e..9ba226cf4 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/Span.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/Span.java
@@ -57,8 +57,16 @@ public class Span{
      * {@see https://github.com/opentracing/specification/blob/master/specification.md#set-a-span-tag}
      */
     @Expose
-    @SerializedName(value="ta")
-    private final Map<String, Object> tags;
+    @SerializedName(value="ts")
+    private final Map<String, String> tagsWithStr;
+
+    @Expose
+    @SerializedName(value="tb")
+    private final Map<String, Boolean> tagsWithBool;
+
+    @Expose
+    @SerializedName(value="ti")
+    private final Map<String, Integer> tagsWithInt;
 
     /**
      * Log is a concept from OpenTracing spec.
@@ -151,7 +159,9 @@ public class Span{
      * Create a new/empty span.
      */
     public Span() {
-        tags = new HashMap<String, Object>();
+        tagsWithStr = new HashMap<String, String>(5);
+        tagsWithBool = new HashMap<String, Boolean>(1);
+        tagsWithInt = new HashMap<String, Integer>(2);
         logs = new LinkedList<LogData>();
     }
 
@@ -194,17 +204,17 @@ public class Span{
      * @return this Span instance, for chaining
      */
     public final Span setTag(String key, String value) {
-        tags.put(key, value);
+        tagsWithStr.put(key, value);
         return this;
     }
 
     public final Span setTag(String key, boolean value) {
-        tags.put(key, value);
+        tagsWithBool.put(key, value);
         return this;
     }
 
-    public final Span setTag(String key, Number value) {
-        tags.put(key, value);
+    public final Span setTag(String key, Integer value) {
+        tagsWithInt.put(key, value);
         return this;
     }
 
@@ -214,7 +224,11 @@ public class Span{
      * @return
      */
     public final Map<String, Object> getTags() {
-        return Collections.unmodifiableMap(tags);
+        Map<String, Object> tags = new HashMap<String, Object>();
+        tags.putAll(tagsWithStr);
+        tags.putAll(tagsWithBool);
+        tags.putAll(tagsWithInt);
+        return tags;
     }
 
     /**
@@ -223,8 +237,16 @@ public class Span{
      * @param key the given tag key.
      * @return tag value.
      */
-    public Object getTag(String key) {
-        return tags.get(key);
+    public String getStrTag(String key) {
+        return tagsWithStr.get(key);
+    }
+
+    public Boolean getBoolTag(String key) {
+        return tagsWithBool.get(key);
+    }
+
+    public Integer getIntTag(String key) {
+        return tagsWithInt.get(key);
     }
 
     /**
@@ -250,7 +272,7 @@ public class Span{
      * @return the Span, for chaining
      * @see Span#log(String)
      */
-    public Span log(Map<String, ?> fields) {
+    public Span log(Map<String, String> fields) {
         logs.add(new LogData(System.currentTimeMillis(), fields));
         return this;
     }
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java
index d5c2edbcf..75e11cdcb 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegment.java
@@ -26,21 +26,21 @@ public class TraceSegment {
      * Every segment has its unique-global-id.
      */
     @Expose
-    @SerializedName(value="ts")
+    @SerializedName(value = "ts")
     private String traceSegmentId;
 
     /**
      * The start time of this trace segment.
      */
     @Expose
-    @SerializedName(value="st")
+    @SerializedName(value = "st")
     private long startTime;
 
     /**
      * The end time of this trace segment.
      */
     @Expose
-    @SerializedName(value="et")
+    @SerializedName(value = "et")
     private long endTime;
 
     /**
@@ -50,7 +50,7 @@ public class TraceSegment {
      * at this moment, we use this {@link #refs} to link them.
      */
     @Expose
-    @SerializedName(value="rs")
+    @SerializedName(value = "rs")
     private List<TraceSegmentRef> refs;
 
     /**
@@ -59,7 +59,7 @@ public class TraceSegment {
      * All active spans are hold and controlled by "skywalking-api" module.
      */
     @Expose
-    @SerializedName(value="ss")
+    @SerializedName(value = "ss")
     private List<Span> spans;
 
     /**
@@ -69,7 +69,7 @@ public class TraceSegment {
      * e.g. account_app, billing_app
      */
     @Expose
-    @SerializedName(value="ac")
+    @SerializedName(value = "ac")
     private String applicationCode;
 
     /**
@@ -86,9 +86,19 @@ public class TraceSegment {
      * multi {@link TraceSegment}s, only using {@link #refs} is not enough for analysis and ui.
      */
     @Expose
-    @SerializedName(value="gt")
+    @SerializedName(value = "gt")
     private DistributedTraceIds relatedGlobalTraces;
 
+    /**
+     * The <code>sampled</code> is a flag, which represent, when this {@link TraceSegment} finished, it need to be send
+     * to Collector.
+     *
+     * Its value depends on SamplingService. True, by default.
+     *
+     * This value is not serialized.
+     */
+    private boolean sampled;
+
     /**
      * Create a trace segment, by given segmentId.
      * This segmentId is generated by TraceSegmentRef, AKA, from tracer/agent module.
@@ -107,6 +117,7 @@ public class TraceSegment {
         this.spans = new LinkedList<Span>();
         this.relatedGlobalTraces = new DistributedTraceIds();
         this.relatedGlobalTraces.append(new NewDistributedTraceId());
+        this.sampled = true;
     }
 
     /**
@@ -118,7 +129,7 @@ public class TraceSegment {
         if (refs == null) {
             refs = new LinkedList<TraceSegmentRef>();
         }
-        if(!refs.contains(refSegment)){
+        if (!refs.contains(refSegment)) {
             refs.add(refSegment);
         }
     }
@@ -183,6 +194,14 @@ public class TraceSegment {
         return applicationCode;
     }
 
+    public boolean isSampled() {
+        return sampled;
+    }
+
+    public void setSampled(boolean sampled) {
+        this.sampled = sampled;
+    }
+
     @Override
     public String toString() {
         return "TraceSegment{" +
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegmentRef.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegmentRef.java
index e900a7182..0a8a6ab21 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegmentRef.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegmentRef.java
@@ -86,25 +86,18 @@ public class TraceSegmentRef{
             '}';
     }
 
-
     @Override
     public boolean equals(Object o) {
-        if (this == o)
-            return true;
-        if (o == null || getClass() != o.getClass())
-            return false;
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
 
-        TraceSegmentRef ref = (TraceSegmentRef)o;
+        TraceSegmentRef that = (TraceSegmentRef) o;
 
-        if (traceSegmentId != null ? !traceSegmentId.equals(ref.traceSegmentId) : ref.traceSegmentId != null)
-            return false;
-        return applicationCode != null ? applicationCode.equals(ref.applicationCode) : ref.applicationCode == null;
+        return traceSegmentId != null ? traceSegmentId.equals(that.traceSegmentId) : that.traceSegmentId == null;
     }
 
     @Override
     public int hashCode() {
-        int result = traceSegmentId != null ? traceSegmentId.hashCode() : 0;
-        result = 31 * result + (applicationCode != null ? applicationCode.hashCode() : 0);
-        return result;
+        return traceSegmentId != null ? traceSegmentId.hashCode() : 0;
     }
 }
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/AbstractTag.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/AbstractTag.java
index 9ffeea26e..e023ac274 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/AbstractTag.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/AbstractTag.java
@@ -7,7 +7,7 @@ import com.a.eye.skywalking.trace.Span;
  * All span's tags inherit from {@link AbstractTag},
  * which provide an easy way to
  *      {@link Span#setTag(String, String)} ,
- *      {@link Span#setTag(String, Number)} ,
+ *      {@link Span#setTag(String, Integer)}
  *      {@link Span#setTag(String, boolean)} ,
  *
  * Created by wusheng on 2017/2/17.
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/BooleanTag.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/BooleanTag.java
index 9f3a780f2..20c83af35 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/BooleanTag.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/BooleanTag.java
@@ -30,13 +30,11 @@ public class BooleanTag extends AbstractTag<Boolean> {
      */
     @Override
     public Boolean get(Span span) {
-        Object tagValue = span.getTag(super.key);
+        Boolean tagValue = span.getBoolTag(super.key);
         if (tagValue == null) {
             return defaultValue;
-        } else if (tagValue instanceof Boolean) {
-            return (Boolean) tagValue;
         } else {
-            return Boolean.valueOf(tagValue.toString());
+            return tagValue;
         }
     }
 }
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/IntTag.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/IntTag.java
index 8af1fec9a..cc6b36b2e 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/IntTag.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/IntTag.java
@@ -26,13 +26,11 @@ public class IntTag extends AbstractTag<Integer> {
      */
     @Override
     public Integer get(Span span) {
-        Object tagValue = span.getTag(super.key);
+        Integer tagValue = span.getIntTag(super.key);
         if (tagValue == null) {
             return null;
-        } else if(tagValue instanceof Integer){
-            return (Integer)tagValue;
-        }else {
-            return Integer.valueOf(tagValue.toString());
+        } else {
+            return tagValue;
         }
     }
 }
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/ShortTag.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/ShortTag.java
index ebd93a607..b7e8f6585 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/ShortTag.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/ShortTag.java
@@ -14,7 +14,7 @@ public class ShortTag extends AbstractTag<Short> {
 
     @Override
     public void set(Span span, Short tagValue) {
-        span.setTag(super.key, tagValue);
+        span.setTag(super.key, (int)tagValue.shortValue());
     }
 
     /**
@@ -25,12 +25,10 @@ public class ShortTag extends AbstractTag<Short> {
      * @return tag value
      */
     @Override public Short get(Span span) {
-        Object tagValue = span.getTag(super.key);
+        Integer tagValue = span.getIntTag(super.key);
         if (tagValue == null) {
             return null;
-        } else if(tagValue instanceof Short){
-            return (Short)tagValue;
-        }else {
+        } else {
             return Short.valueOf(tagValue.toString());
         }
     }
diff --git a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/StringTag.java b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/StringTag.java
index 229521287..e76825c9c 100644
--- a/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/StringTag.java
+++ b/skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/StringTag.java
@@ -19,6 +19,6 @@ public class StringTag extends AbstractTag<String> {
     }
 
     @Override public String get(Span span) {
-        return (String)span.getTag(super.key);
+        return span.getStrTag(super.key);
     }
 }
diff --git a/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/LogDataTestCase.java b/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/LogDataTestCase.java
index 316c278ac..f2f616d22 100644
--- a/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/LogDataTestCase.java
+++ b/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/LogDataTestCase.java
@@ -11,7 +11,7 @@ import org.junit.Test;
 public class LogDataTestCase {
     @Test
     public void testHoldValue(){
-        Map<String, ?> fields = new HashMap<String, String>();
+        Map<String, String> fields = new HashMap<String, String>();
         LogData logData = new LogData(123L, fields);
 
         Assert.assertEquals(123, logData.getTime());
diff --git a/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/tag/TagsTest.java b/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/tag/TagsTest.java
index 3bb2b4d55..7cb908ffc 100644
--- a/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/tag/TagsTest.java
+++ b/skywalking-commons/skywalking-trace/src/test/java/com/a/eye/skywalking/trace/tag/TagsTest.java
@@ -12,13 +12,13 @@ public class TagsTest {
     public void testLayer(){
         Span span = new Span(1, "/test");
         Tags.SPAN_LAYER.asDB(span);
-        Assert.assertEquals("db", span.getTag("span.layer"));
+        Assert.assertEquals("db", span.getStrTag("span.layer"));
 
         Tags.SPAN_LAYER.asRPCFramework(span);
-        Assert.assertEquals("rpc", span.getTag("span.layer"));
+        Assert.assertEquals("rpc", span.getStrTag("span.layer"));
 
         Tags.SPAN_LAYER.asHttp(span);
-        Assert.assertEquals("http", span.getTag("span.layer"));
+        Assert.assertEquals("http", span.getStrTag("span.layer"));
     }
 
     @Test
diff --git a/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml b/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml
index 014bb63e4..0d5b89395 100644
--- a/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml
+++ b/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml
@@ -36,23 +36,20 @@
                   </manifestEntries>
                 </transformer>
               </transformers>
+              <artifactSet>
+                <excludes>
+                  <exclude>com.lmax:*</exclude>
+                  <exclude>org.apache.httpcomponents:*</exclude>
+                  <exclude>commons-logging:*</exclude>
+                  <exclude>commons-codec:*</exclude>
+                  <exclude>*:gson</exclude>
+                </excludes>
+              </artifactSet>
               <relocations>
                 <relocation>
                   <pattern>${shade.net.bytebuddy.source}</pattern>
                   <shadedPattern>${shade.net.bytebuddy.target}</shadedPattern>
                 </relocation>
-                <relocation>
-                  <pattern>${shade.com.lmax.disruptor.source}</pattern>
-                  <shadedPattern>${shade.com.lmax.disruptor.target}</shadedPattern>
-                </relocation>
-                <relocation>
-                  <pattern>${shade.com.google.source}</pattern>
-                  <shadedPattern>${shade.com.google.target}</shadedPattern>
-                </relocation>
-                <relocation>
-                  <pattern>${shade.org.apache.source}</pattern>
-                  <shadedPattern>${shade.org.apache.target}</shadedPattern>
-                </relocation>
               </relocations>
             </configuration>
           </execution>
@@ -61,6 +58,12 @@
     </plugins>
   </build>
   <dependencies>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>2.8.0</version>
+      <scope>compile</scope>
+    </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
@@ -120,17 +123,11 @@
     </repository>
   </distributionManagement>
   <properties>
-    <shade.org.apache.source>org.apache</shade.org.apache.source>
-    <shade.package>com.a.eye.skywalking.dependencies</shade.package>
-    <shade.com.google.source>com.google</shade.com.google.source>
     <shade.net.bytebuddy.target>${shade.package}.${shade.net.bytebuddy.source}</shade.net.bytebuddy.target>
-    <shade.com.lmax.disruptor.target>${shade.package}.${shade.com.lmax.disruptor.source}</shade.com.lmax.disruptor.target>
+    <shade.package>com.a.eye.skywalking.dependencies</shade.package>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <shade.net.bytebuddy.source>net.bytebuddy</shade.net.bytebuddy.source>
-    <shade.com.google.target>${shade.package}.${shade.com.google.source}</shade.com.google.target>
-    <shade.org.apache.target>${shade.package}.${shade.org.apache.source}</shade.org.apache.target>
     <premain.class>com.a.eye.skywalking.agent.SkyWalkingAgent</premain.class>
-    <shade.com.lmax.disruptor.source>com.lmax.disruptor</shade.com.lmax.disruptor.source>
   </properties>
 </project>
 
diff --git a/skywalking-sniffer/skywalking-agent/pom.xml b/skywalking-sniffer/skywalking-agent/pom.xml
index d807e4a1f..fcc5b7fe8 100644
--- a/skywalking-sniffer/skywalking-agent/pom.xml
+++ b/skywalking-sniffer/skywalking-agent/pom.xml
@@ -21,13 +21,6 @@
         <shade.package>com.a.eye.skywalking.dependencies</shade.package>
         <shade.net.bytebuddy.source>net.bytebuddy</shade.net.bytebuddy.source>
         <shade.net.bytebuddy.target>${shade.package}.${shade.net.bytebuddy.source}</shade.net.bytebuddy.target>
-        <shade.com.lmax.disruptor.source>com.lmax.disruptor</shade.com.lmax.disruptor.source>
-        <shade.com.lmax.disruptor.target>${shade.package}.${shade.com.lmax.disruptor.source}
-        </shade.com.lmax.disruptor.target>
-        <shade.com.google.source>com.google</shade.com.google.source>
-        <shade.com.google.target>${shade.package}.${shade.com.google.source}</shade.com.google.target>
-        <shade.org.apache.source>org.apache</shade.org.apache.source>
-        <shade.org.apache.target>${shade.package}.${shade.org.apache.source}</shade.org.apache.target>
     </properties>
 
     <dependencies>
@@ -123,23 +116,20 @@
                                     </manifestEntries>
                                 </transformer>
                             </transformers>
+                            <artifactSet>
+                                <excludes>
+                                    <exclude>com.lmax:*</exclude>
+                                    <exclude>org.apache.httpcomponents:*</exclude>
+                                    <exclude>commons-logging:*</exclude>
+                                    <exclude>commons-codec:*</exclude>
+                                    <exclude>*:gson</exclude>
+                                </excludes>
+                            </artifactSet>
                             <relocations>
                                 <relocation>
                                     <pattern>${shade.net.bytebuddy.source}</pattern>
                                     <shadedPattern>${shade.net.bytebuddy.target}</shadedPattern>
                                 </relocation>
-                                <relocation>
-                                    <pattern>${shade.com.lmax.disruptor.source}</pattern>
-                                    <shadedPattern>${shade.com.lmax.disruptor.target}</shadedPattern>
-                                </relocation>
-                                <relocation>
-                                    <pattern>${shade.com.google.source}</pattern>
-                                    <shadedPattern>${shade.com.google.target}</shadedPattern>
-                                </relocation>
-                                <relocation>
-                                    <pattern>${shade.org.apache.source}</pattern>
-                                    <shadedPattern>${shade.org.apache.target}</shadedPattern>
-                                </relocation>
                             </relocations>
                         </configuration>
                     </execution>
diff --git a/skywalking-sniffer/skywalking-agent/src/main/java/com/a/eye/skywalking/agent/SkyWalkingAgent.java b/skywalking-sniffer/skywalking-agent/src/main/java/com/a/eye/skywalking/agent/SkyWalkingAgent.java
index ea6ba500e..d2f2a659c 100644
--- a/skywalking-sniffer/skywalking-agent/src/main/java/com/a/eye/skywalking/agent/SkyWalkingAgent.java
+++ b/skywalking-sniffer/skywalking-agent/src/main/java/com/a/eye/skywalking/agent/SkyWalkingAgent.java
@@ -99,8 +99,8 @@ public class SkyWalkingAgent {
 
 
     private static void initConfig() {
-        Config.SkyWalking.IS_PREMAIN_MODE = true;
-        Config.SkyWalking.AGENT_BASE_PATH = initAgentBasePath();
+        Config.Agent.IS_PREMAIN_MODE = true;
+        Config.Agent.PATH = initAgentBasePath();
 
         SnifferConfigInitializer.initialize();
     }
diff --git a/skywalking-sniffer/skywalking-api/pom.xml b/skywalking-sniffer/skywalking-api/pom.xml
index f57880769..eab817765 100644
--- a/skywalking-sniffer/skywalking-api/pom.xml
+++ b/skywalking-sniffer/skywalking-api/pom.xml
@@ -17,6 +17,15 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <jetty.version>9.4.2.v20170220</jetty.version>
+
+        <shade.package>com.a.eye.skywalking.dependencies</shade.package>
+        <shade.com.lmax.disruptor.source>com.lmax.disruptor</shade.com.lmax.disruptor.source>
+        <shade.com.lmax.disruptor.target>${shade.package}.${shade.com.lmax.disruptor.source}
+        </shade.com.lmax.disruptor.target>
+        <shade.com.google.source>com.google</shade.com.google.source>
+        <shade.com.google.target>${shade.package}.${shade.com.google.source}</shade.com.google.target>
+        <shade.org.apache.source>org.apache</shade.org.apache.source>
+        <shade.org.apache.target>${shade.package}.${shade.org.apache.source}</shade.org.apache.target>
     </properties>
 
     <dependencies>
@@ -74,6 +83,40 @@
                     <encoding>${project.build.sourceEncoding}</encoding>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>2.4.1</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <artifactSet>
+                                <excludes>
+                                    <exclude>net.bytebuddy:byte-buddy:jar:</exclude>
+                                </excludes>
+                            </artifactSet>
+                            <relocations>
+                                <relocation>
+                                    <pattern>${shade.com.lmax.disruptor.source}</pattern>
+                                    <shadedPattern>${shade.com.lmax.disruptor.target}</shadedPattern>
+                                </relocation>
+                                <relocation>
+                                    <pattern>${shade.com.google.source}</pattern>
+                                    <shadedPattern>${shade.com.google.target}</shadedPattern>
+                                </relocation>
+                                <relocation>
+                                    <pattern>${shade.org.apache.source}</pattern>
+                                    <shadedPattern>${shade.org.apache.target}</shadedPattern>
+                                </relocation>
+                            </relocations>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/client/CollectorClient.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/client/CollectorClient.java
index 63e6a8b94..b77f95625 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/client/CollectorClient.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/client/CollectorClient.java
@@ -1,11 +1,21 @@
 package com.a.eye.skywalking.api.client;
 
 import com.a.eye.skywalking.api.boot.ServiceManager;
+import com.a.eye.skywalking.api.conf.Config;
 import com.a.eye.skywalking.api.queue.TraceSegmentProcessQueue;
 import com.a.eye.skywalking.logging.ILog;
 import com.a.eye.skywalking.logging.LogManager;
+import com.a.eye.skywalking.trace.SegmentsMessage;
 import com.a.eye.skywalking.trace.TraceSegment;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import java.io.IOException;
 import java.util.List;
+import java.util.Random;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.entity.ContentType;
+import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
 import org.apache.http.impl.client.HttpClients;
@@ -21,11 +31,18 @@ public class CollectorClient implements Runnable {
     private static ILog logger = LogManager.getLogger(CollectorClient.class);
     private static long SLEEP_TIME_MILLIS = 500;
     private CloseableHttpClient httpclient;
+    private String[] serverList;
+    private volatile int selectedServer = -1;
 
     public CollectorClient() {
+        serverList = Config.Collector.SERVERS.split(",");
         httpclient = HttpClients.custom()
             .setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy())
             .build();
+        Random r = new Random();
+        if (serverList.length > 0) {
+            selectedServer = r.nextInt(serverList.length);
+        }
     }
 
     @Override
@@ -36,13 +53,19 @@ public class CollectorClient implements Runnable {
                 TraceSegmentProcessQueue segmentProcessQueue = ServiceManager.INSTANCE.findService(TraceSegmentProcessQueue.class);
                 List<TraceSegment> cachedTraceSegments = segmentProcessQueue.getCachedTraceSegments();
                 if (cachedTraceSegments.size() > 0) {
+                    SegmentsMessage message = null;
+                    int count = 0;
                     for (TraceSegment segment : cachedTraceSegments) {
-                        /**
-                         * No receiver found, means collector server is off-line.
-                         */
-                        sleepTime = SLEEP_TIME_MILLIS * 10;
-                        break;
+                        if (message == null) {
+                            message = new SegmentsMessage();
+                        }
+                        message.append(segment);
+                        if (count == Config.Collector.BATCH_SIZE) {
+                            sendToCollector(message);
+                            message = null;
+                        }
                     }
+                    sendToCollector(message);
                 } else {
                     sleepTime = SLEEP_TIME_MILLIS;
                 }
@@ -56,6 +79,64 @@ public class CollectorClient implements Runnable {
         }
     }
 
+    /**
+     * Send the given {@link SegmentsMessage} to collector.
+     *
+     * @param message to be send.
+     */
+    private void sendToCollector(SegmentsMessage message) throws RESTResponseStatusError, IOException {
+        if (message == null) {
+            return;
+        }
+        Gson gson = new GsonBuilder()
+            .excludeFieldsWithoutExposeAnnotation()
+            .create();
+        String messageJson = gson.toJson(message);
+
+        try {
+            HttpPost httpPost = ready2Send(messageJson);
+            if (httpPost != null) {
+                CloseableHttpResponse httpResponse = httpclient.execute(httpPost);
+                int statusCode = httpResponse.getStatusLine().getStatusCode();
+                if (200 != statusCode) {
+                    findBackupServer();
+                    throw new RESTResponseStatusError(statusCode);
+                }
+            }
+        } catch (IOException e) {
+            findBackupServer();
+            throw e;
+        }
+    }
+
+    /**
+     * Prepare the given message for HTTP Post service.
+     *
+     * @param messageJson to send
+     * @return {@link HttpPost}, when is ready to send. otherwise, null.
+     */
+    private HttpPost ready2Send(String messageJson) {
+        if (selectedServer == -1) {
+            //no available server
+            return null;
+        }
+        HttpPost post = new HttpPost("http://" + serverList[selectedServer] + Config.Collector.SERVICE_NAME);
+        StringEntity entity = new StringEntity(messageJson, ContentType.APPLICATION_JSON);
+        post.setEntity(entity);
+
+        return post;
+    }
+
+    /**
+     * Choose the next server in {@link #serverList}, by moving {@link #selectedServer}.
+     */
+    private void findBackupServer() {
+        selectedServer++;
+        if (selectedServer == serverList.length) {
+            selectedServer = 0;
+        }
+    }
+
     /**
      * Try to sleep, and ignore the {@link InterruptedException}
      *
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/client/RESTResponseStatusError.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/client/RESTResponseStatusError.java
new file mode 100644
index 000000000..db74873bd
--- /dev/null
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/client/RESTResponseStatusError.java
@@ -0,0 +1,13 @@
+package com.a.eye.skywalking.api.client;
+
+/**
+ * The <code>RESTResponseStatusError</code> represents the REST-Service client got an unexpected response code.
+ * Most likely, the response code is not 200.
+ *
+ * @author wusheng
+ */
+class RESTResponseStatusError extends Exception {
+    RESTResponseStatusError(int responseCode){
+        super("Unexpected service response code: " + responseCode);
+    }
+}
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/Config.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/Config.java
index e2cfae6d0..402b4be81 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/Config.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/Config.java
@@ -2,20 +2,26 @@ package com.a.eye.skywalking.api.conf;
 
 public class Config {
 
-    public static class SkyWalking {
+    public static class Agent {
         public static String APPLICATION_CODE = "";
 
         public static boolean IS_PREMAIN_MODE = false;
 
-        public static String AGENT_BASE_PATH = "";
+        public static String PATH = "";
 
+        public static int SAMPLING_RATE = 10000;
+    }
+
+    public static class Collector{
         public static String SERVERS = "";
 
         public static String SERVICE_NAME = "/segments";
+
+        public static int BATCH_SIZE = 50;
     }
 
-    public static class Disruptor{
-        public static int BUFFER_SIZE = 512;
+    public static class Buffer {
+        public static int SIZE = 512;
     }
 
 
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializer.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializer.java
index 6b63b2a44..9c9fd2f17 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializer.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializer.java
@@ -15,7 +15,7 @@ public class SnifferConfigInitializer {
 
     public static void initialize() {
         InputStream configFileStream;
-        if (Config.SkyWalking.IS_PREMAIN_MODE) {
+        if (Config.Agent.IS_PREMAIN_MODE) {
             configFileStream = fetchAuthFileInputStream();
         } else {
             configFileStream = SnifferConfigInitializer.class.getResourceAsStream("/sky-walking.config");
@@ -35,24 +35,24 @@ public class SnifferConfigInitializer {
 
         String applicationCode = System.getProperty("applicationCode");
         if (!StringUtil.isEmpty(applicationCode)) {
-            Config.SkyWalking.APPLICATION_CODE = applicationCode;
+            Config.Agent.APPLICATION_CODE = applicationCode;
         }
         String servers = System.getProperty("servers");
         if(!StringUtil.isEmpty(servers)) {
-            Config.SkyWalking.SERVERS = servers;
+            Config.Collector.SERVERS = servers;
         }
 
-        if (StringUtil.isEmpty(Config.SkyWalking.APPLICATION_CODE)) {
+        if (StringUtil.isEmpty(Config.Agent.APPLICATION_CODE)) {
             throw new ExceptionInInitializerError("'-DapplicationCode=' is missing.");
         }
-        if (StringUtil.isEmpty(Config.SkyWalking.SERVERS)) {
+        if (StringUtil.isEmpty(Config.Collector.SERVERS)) {
             throw new ExceptionInInitializerError("'-Dservers=' is missing.");
         }
     }
 
     private static InputStream fetchAuthFileInputStream() {
         try {
-            return new FileInputStream(Config.SkyWalking.AGENT_BASE_PATH + File.separator + "sky-walking.config");
+            return new FileInputStream(Config.Agent.PATH + File.separator + "sky-walking.config");
         } catch (Exception e) {
             logger.warn("sky-walking.config is missing, use default config.");
             return null;
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/ContextCarrier.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/ContextCarrier.java
index 684922194..9c653518b 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/ContextCarrier.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/ContextCarrier.java
@@ -42,6 +42,11 @@ public class ContextCarrier implements Serializable {
      */
     private List<DistributedTraceId> distributedTraceIds;
 
+    /**
+     * {@link TraceSegment#sampled}
+     */
+    private boolean sampled;
+
     /**
      * Serialize this {@link ContextCarrier} to a {@link String},
      * with '|' split.
@@ -54,7 +59,8 @@ public class ContextCarrier implements Serializable {
             this.getSpanId() + "",
             this.getApplicationCode(),
             this.getPeerHost(),
-            this.serializeDistributedTraceIds());
+            this.serializeDistributedTraceIds(),
+            this.isSampled() ? "1" : "0");
     }
 
     /**
@@ -64,14 +70,15 @@ public class ContextCarrier implements Serializable {
      */
     public ContextCarrier deserialize(String text) {
         if (text != null) {
-            String[] parts = text.split("\\|", 5);
-            if (parts.length == 5) {
+            String[] parts = text.split("\\|", 6);
+            if (parts.length == 6) {
                 try {
                     setSpanId(Integer.parseInt(parts[1]));
                     setTraceSegmentId(parts[0]);
                     setApplicationCode(parts[2]);
                     setPeerHost(parts[3]);
                     setDistributedTraceIds(deserializeDistributedTraceIds(parts[4]));
+                    setSampled("1".equals(parts[5]));
                 } catch (NumberFormatException e) {
 
                 }
@@ -129,6 +136,14 @@ public class ContextCarrier implements Serializable {
         return distributedTraceIds;
     }
 
+    public boolean isSampled() {
+        return sampled;
+    }
+
+    public void setSampled(boolean sampled) {
+        this.sampled = sampled;
+    }
+
     public void setDistributedTraceIds(List<DistributedTraceId> distributedTraceIds) {
         this.distributedTraceIds = distributedTraceIds;
     }
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java
index e484e0d4d..a2a6c5b26 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java
@@ -1,6 +1,8 @@
 package com.a.eye.skywalking.api.context;
 
+import com.a.eye.skywalking.api.boot.ServiceManager;
 import com.a.eye.skywalking.api.conf.Config;
+import com.a.eye.skywalking.api.sampling.SamplingService;
 import com.a.eye.skywalking.trace.Span;
 import com.a.eye.skywalking.trace.TraceSegment;
 import com.a.eye.skywalking.trace.TraceSegmentRef;
@@ -34,7 +36,8 @@ public final class TracerContext {
      * Create a {@link TraceSegment} and init {@link #spanIdGenerator} as 0;
      */
     TracerContext() {
-        this.segment = new TraceSegment(Config.SkyWalking.APPLICATION_CODE);
+        this.segment = new TraceSegment(Config.Agent.APPLICATION_CODE);
+        ServiceManager.INSTANCE.findService(SamplingService.class).trySampling(this.segment);
         this.spanIdGenerator = 0;
     }
 
@@ -123,9 +126,10 @@ public final class TracerContext {
     public void inject(ContextCarrier carrier) {
         carrier.setTraceSegmentId(this.segment.getTraceSegmentId());
         carrier.setSpanId(this.activeSpan().getSpanId());
-        carrier.setApplicationCode(Config.SkyWalking.APPLICATION_CODE);
+        carrier.setApplicationCode(Config.Agent.APPLICATION_CODE);
         carrier.setPeerHost(Tags.PEER_HOST.get(activeSpan()));
         carrier.setDistributedTraceIds(this.segment.getRelatedGlobalTraces());
+        carrier.setSampled(this.segment.isSampled());
     }
 
     /**
@@ -137,6 +141,7 @@ public final class TracerContext {
     public void extract(ContextCarrier carrier) {
         if(carrier.isValid()) {
             this.segment.ref(getRef(carrier));
+            ServiceManager.INSTANCE.findService(SamplingService.class).setSampleWhenExtract(this.segment, carrier);
             this.segment.relatedGlobalTraces(carrier.getDistributedTraceIds());
         }
     }
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/SyncFileWriter.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/SyncFileWriter.java
index 99d081143..72b305f2b 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/SyncFileWriter.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/SyncFileWriter.java
@@ -19,7 +19,7 @@ public class SyncFileWriter implements IWriter {
 
     private SyncFileWriter() {
         try {
-            File logFilePath = new File(Config.SkyWalking.AGENT_BASE_PATH, Config.Logging.LOG_DIR_NAME);
+            File logFilePath = new File(Config.Agent.PATH, Config.Logging.LOG_DIR_NAME);
             if (!logFilePath.exists()) {
                 logFilePath.mkdirs();
             }
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/WriterFactory.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/WriterFactory.java
index fc38edfee..6e5bd4230 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/WriterFactory.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/logging/WriterFactory.java
@@ -4,7 +4,7 @@ import com.a.eye.skywalking.api.conf.Config;
 
 public class WriterFactory {
     public static IWriter getLogWriter(){
-        if (Config.SkyWalking.IS_PREMAIN_MODE){
+        if (Config.Agent.IS_PREMAIN_MODE){
             return SyncFileWriter.instance();
         }else{
             return new STDOutWriter();
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/queue/TraceSegmentProcessQueue.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/queue/TraceSegmentProcessQueue.java
index d868de9f4..94ceac768 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/queue/TraceSegmentProcessQueue.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/queue/TraceSegmentProcessQueue.java
@@ -30,8 +30,8 @@ public class TraceSegmentProcessQueue extends StatusBootService implements Trace
     private volatile int cacheIndex;
 
     public TraceSegmentProcessQueue() {
-        disruptor = new Disruptor<TraceSegmentHolder>(TraceSegmentHolder.Factory.INSTANCE, Config.Disruptor.BUFFER_SIZE, DaemonThreadFactory.INSTANCE);
-        secondLevelCache = new TraceSegment[Config.Disruptor.BUFFER_SIZE];
+        disruptor = new Disruptor<TraceSegmentHolder>(TraceSegmentHolder.Factory.INSTANCE, Config.Buffer.SIZE, DaemonThreadFactory.INSTANCE);
+        secondLevelCache = new TraceSegment[Config.Buffer.SIZE];
         cacheIndex = 0;
         disruptor.handleEventsWith(this);
         buffer = disruptor.getRingBuffer();
@@ -43,9 +43,14 @@ public class TraceSegmentProcessQueue extends StatusBootService implements Trace
         disruptor.start();
     }
 
+    /**
+     * Append the given traceSegment to the queue, wait for sending to Collector.
+     *
+     * @param traceSegment finished {@link TraceSegment}
+     */
     @Override
     public void afterFinished(TraceSegment traceSegment) {
-        if (isStarted()) {
+        if (isStarted() && traceSegment.isSampled()) {
             long sequence = this.buffer.next();  // Grab the next sequence
             try {
                 TraceSegmentHolder data = this.buffer.get(sequence);
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/sampling/IllegalSamplingRateException.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/sampling/IllegalSamplingRateException.java
new file mode 100644
index 000000000..bb89d7a86
--- /dev/null
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/sampling/IllegalSamplingRateException.java
@@ -0,0 +1,12 @@
+package com.a.eye.skywalking.api.sampling;
+
+/**
+ * Use <code>IllegalSamplingRateException</code>, only if the rate can not be supported.
+ *
+ * @author wusheng
+ */
+public class IllegalSamplingRateException extends Exception {
+    IllegalSamplingRateException(String message) {
+        super(message);
+    }
+}
diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/sampling/SamplingService.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/sampling/SamplingService.java
new file mode 100644
index 000000000..6967c203d
--- /dev/null
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/sampling/SamplingService.java
@@ -0,0 +1,67 @@
+package com.a.eye.skywalking.api.sampling;
+
+import com.a.eye.skywalking.api.boot.BootService;
+import com.a.eye.skywalking.api.conf.Config;
+import com.a.eye.skywalking.api.context.ContextCarrier;
+import com.a.eye.skywalking.logging.ILog;
+import com.a.eye.skywalking.logging.LogManager;
+import com.a.eye.skywalking.trace.TraceSegment;
+
+/**
+ * The <code>SamplingService</code> take charge of how to sample the {@link TraceSegment}. Every {@link TraceSegment}s
+ * have been traced, but, considering CPU cost of serialization/deserialization, and network bandwidth, the agent do NOT
+ * send all of them to collector, if SAMPLING is on.
+ *
+ * By default, SAMPLING is off, and {@link Config.Agent#SAMPLING_RATE} == 1000.
+ *
+ * @author wusheng
+ */
+public class SamplingService implements BootService {
+    private static ILog logger = LogManager.getLogger(SamplingService.class);
+
+    private volatile boolean on = false;
+    private volatile int rate = 0;
+    private volatile int rollingSeed = 0;
+
+    @Override
+    public void bootUp() throws Throwable {
+        if (Config.Agent.SAMPLING_RATE == 10000) {
+            return;
+        }
+        if (Config.Agent.SAMPLING_RATE > 10000 || Config.Agent.SAMPLING_RATE < 1) {
+            throw new IllegalSamplingRateException("sampling rate should stay in (0, 10000].");
+        }
+        rate = 10000 / Config.Agent.SAMPLING_RATE;
+        on = true;
+
+        logger.debug("The trace sampling is on, and the sampling rate is: {}", rate);
+    }
+
+    public void trySampling(TraceSegment segment) {
+        if (on) {
+            if (rollingSeed++ != rate) {
+                segment.setSampled(false);
+            }
+        }
+    }
+
+    /**
+     * Set the {@link TraceSegment} to sampled, when {@link ContextCarrier} contains "isSampled" flag.
+     *
+     * A -> B, if TraceSegment is sampled in A, then the related TraceSegment in B must be sampled, no matter you
+     * sampling rate. And reset the {@link #rollingSeed}, in case of too many {@link TraceSegment}s, which started in
+     * this JVM, are sampled.
+     *
+     * @param segment the current TraceSegment.
+     * @param carrier
+     */
+    public void setSampleWhenExtract(TraceSegment segment, ContextCarrier carrier) {
+        if(on) {
+            if (!segment.isSampled() && carrier.isSampled()) {
+                segment.setSampled(true);
+                this.rollingSeed = 0;
+            }
+        }
+    }
+
+}
diff --git a/skywalking-sniffer/skywalking-api/src/main/resources/META-INF/services/com.a.eye.skywalking.api.boot.BootService b/skywalking-sniffer/skywalking-api/src/main/resources/META-INF/services/com.a.eye.skywalking.api.boot.BootService
index c84f7acac..0a0bbb211 100644
--- a/skywalking-sniffer/skywalking-api/src/main/resources/META-INF/services/com.a.eye.skywalking.api.boot.BootService
+++ b/skywalking-sniffer/skywalking-api/src/main/resources/META-INF/services/com.a.eye.skywalking.api.boot.BootService
@@ -1,3 +1,4 @@
 com.a.eye.skywalking.api.queue.TraceSegmentProcessQueue
 com.a.eye.skywalking.api.context.ContextManager
 com.a.eye.skywalking.api.client.CollectorClientService
+com.a.eye.skywalking.api.sampling.SamplingService
diff --git a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/client/HTTPRestServiceTestApp.java b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/client/HTTPRestServiceTestApp.java
index de4a3d068..24f481fb5 100644
--- a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/client/HTTPRestServiceTestApp.java
+++ b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/client/HTTPRestServiceTestApp.java
@@ -75,7 +75,7 @@ public class HTTPRestServiceTestApp {
                 baseRequest.setHandled(true);
             }
         });
-        //server.start();
+        server.start();
         return server;
     }
 
diff --git a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializerTest.java b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializerTest.java
index 4804c74ba..befd85f85 100644
--- a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializerTest.java
+++ b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/conf/SnifferConfigInitializerTest.java
@@ -11,13 +11,13 @@ public class SnifferConfigInitializerTest {
 
     @Test
     public void testInitialize(){
-        Config.SkyWalking.IS_PREMAIN_MODE = false;
+        Config.Agent.IS_PREMAIN_MODE = false;
         SnifferConfigInitializer.initialize();
 
-        Assert.assertEquals("crmApp", Config.SkyWalking.APPLICATION_CODE);
-        Assert.assertEquals("127.0.0.1:8080", Config.SkyWalking.SERVERS);
+        Assert.assertEquals("crmApp", Config.Agent.APPLICATION_CODE);
+        Assert.assertEquals("127.0.0.1:8080", Config.Collector.SERVERS);
 
-        Assert.assertNotNull(Config.Disruptor.BUFFER_SIZE);
+        Assert.assertNotNull(Config.Buffer.SIZE);
         Assert.assertNotNull(Config.Logging.LOG_DIR_NAME);
         Assert.assertNotNull(Config.Logging.LOG_FILE_NAME);
         Assert.assertNotNull(Config.Logging.MAX_LOG_FILE_LENGTH);
@@ -26,12 +26,12 @@ public class SnifferConfigInitializerTest {
 
     @Test(expected = ExceptionInInitializerError.class)
     public void testErrorInitialize(){
-        Config.SkyWalking.IS_PREMAIN_MODE = true;
+        Config.Agent.IS_PREMAIN_MODE = true;
         SnifferConfigInitializer.initialize();
     }
 
     @AfterClass
     public static void reset(){
-        Config.SkyWalking.IS_PREMAIN_MODE = false;
+        Config.Agent.IS_PREMAIN_MODE = false;
     }
 }
diff --git a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextCarrierTestCase.java b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextCarrierTestCase.java
index 269911b79..6809afed6 100644
--- a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextCarrierTestCase.java
+++ b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextCarrierTestCase.java
@@ -18,17 +18,18 @@ public class ContextCarrierTestCase {
         carrier.setSpanId(100);
         carrier.setApplicationCode("REMOTE_APP");
         carrier.setPeerHost("10.2.3.16:8080");
+        carrier.setSampled(true);
         List<DistributedTraceId> ids = new LinkedList<DistributedTraceId>();
         ids.add(new PropagatedTraceId("Trace.global.id.123"));
         carrier.setDistributedTraceIds(ids);
 
-        Assert.assertEquals("trace_id_A|100|REMOTE_APP|10.2.3.16:8080|Trace.global.id.123", carrier.serialize());
+        Assert.assertEquals("trace_id_A|100|REMOTE_APP|10.2.3.16:8080|Trace.global.id.123|1", carrier.serialize());
     }
 
     @Test
     public void testDeserialize(){
         ContextCarrier carrier = new ContextCarrier();
-        carrier.deserialize("trace_id_A|100|REMOTE_APP|10.2.3.16:8080|Trace.global.id.123,Trace.global.id.222");
+        carrier.deserialize("trace_id_A|100|REMOTE_APP|10.2.3.16:8080|Trace.global.id.123,Trace.global.id.222|1");
 
         Assert.assertEquals("trace_id_A", carrier.getTraceSegmentId());
         Assert.assertEquals(100, carrier.getSpanId());
@@ -36,6 +37,7 @@ public class ContextCarrierTestCase {
         Assert.assertEquals("10.2.3.16:8080", carrier.getPeerHost());
         Assert.assertEquals("Trace.global.id.123", carrier.getDistributedTraceIds().get(0).get());
         Assert.assertEquals("Trace.global.id.222", carrier.getDistributedTraceIds().get(1).get());
+        Assert.assertEquals(true, carrier.isSampled());
     }
 
     @Test
@@ -62,6 +64,10 @@ public class ContextCarrierTestCase {
 
         carrier = new ContextCarrier();
         carrier.deserialize("trace_id|100|REMOTE_APP|10.2.3.16:8080|Trace.global.id.123,Trace.global.id.222");
+        Assert.assertFalse(carrier.isValid());
+
+        carrier = new ContextCarrier();
+        carrier.deserialize("trace_id|100|REMOTE_APP|10.2.3.16:8080|Trace.global.id.123,Trace.global.id.222|0");
         Assert.assertTrue(carrier.isValid());
     }
 }
diff --git a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextManagerTestCase.java b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextManagerTestCase.java
index f0b092a0b..bef3c3c5d 100644
--- a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextManagerTestCase.java
+++ b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/ContextManagerTestCase.java
@@ -1,16 +1,23 @@
 package com.a.eye.skywalking.api.context;
 
+import com.a.eye.skywalking.api.boot.ServiceManager;
 import com.a.eye.skywalking.trace.Span;
 import com.a.eye.skywalking.trace.TraceSegment;
 import com.a.eye.skywalking.trace.tag.Tags;
 import org.junit.After;
 import org.junit.Assert;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 /**
  * Created by wusheng on 2017/2/19.
  */
 public class ContextManagerTestCase {
+    @BeforeClass
+    public static void setup(){
+        ServiceManager.INSTANCE.boot();
+    }
+
     @Test
     public void testDelegateToTracerContext(){
         Span span = ContextManager.createSpan("serviceA");
diff --git a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/EasyLoggerTest.java b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/EasyLoggerTest.java
index 0e6cd274c..854798abc 100644
--- a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/EasyLoggerTest.java
+++ b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/EasyLoggerTest.java
@@ -26,7 +26,7 @@ public class EasyLoggerTest {
 
     @Test
     public void testLog(){
-        Config.SkyWalking.IS_PREMAIN_MODE = false;
+        Config.Agent.IS_PREMAIN_MODE = false;
 
         PrintStream output = Mockito.mock(PrintStream.class);
         System.setOut(output);
diff --git a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/WriterFactoryTest.java b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/WriterFactoryTest.java
index eec580928..d7adefd40 100644
--- a/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/WriterFactoryTest.java
+++ b/skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/logging/WriterFactoryTest.java
@@ -25,18 +25,18 @@ public class WriterFactoryTest {
      */
     @Test
     public void testGetLogWriter(){
-        Config.SkyWalking.IS_PREMAIN_MODE = true;
+        Config.Agent.IS_PREMAIN_MODE = true;
         PrintStream mockStream = Mockito.mock(PrintStream.class);
         System.setErr(mockStream);
         Assert.assertEquals(SyncFileWriter.instance(), WriterFactory.getLogWriter());
 
-        Config.SkyWalking.IS_PREMAIN_MODE = false;
+        Config.Agent.IS_PREMAIN_MODE = false;
         Assert.assertTrue(WriterFactory.getLogWriter() instanceof STDOutWriter);
     }
 
     @AfterClass
     public static void reset(){
-        Config.SkyWalking.IS_PREMAIN_MODE = false;
+        Config.Agent.IS_PREMAIN_MODE = false;
         System.setErr(errRef);
     }
 }
diff --git a/skywalking-sniffer/skywalking-api/src/test/resources/sky-walking.config b/skywalking-sniffer/skywalking-api/src/test/resources/sky-walking.config
index 7817dd446..b563dfb11 100644
--- a/skywalking-sniffer/skywalking-api/src/test/resources/sky-walking.config
+++ b/skywalking-sniffer/skywalking-api/src/test/resources/sky-walking.config
@@ -1,2 +1,2 @@
-skywalking.application_code = crmApp
-skywalking.servers = 127.0.0.1:8080
+agent.application_code = crmApp
+collector.servers = 127.0.0.1:8080
diff --git a/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/pom.xml b/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/pom.xml
index 1fa1a6eaf..bd8525c12 100644
--- a/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/pom.xml
+++ b/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/pom.xml
@@ -18,11 +18,6 @@
     </properties>
 
     <dependencies>
-        <dependency>
-            <groupId>com.a.eye</groupId>
-            <artifactId>skywalking-api</artifactId>
-            <version>3.0-2017</version>
-        </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context</artifactId>
diff --git a/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/src/test/java/com/a/eye/skywalking/plugin/dubbo/DubboInterceptorTest.java b/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/src/test/java/com/a/eye/skywalking/plugin/dubbo/DubboInterceptorTest.java
index 4e479b039..75026a8dd 100644
--- a/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/src/test/java/com/a/eye/skywalking/plugin/dubbo/DubboInterceptorTest.java
+++ b/skywalking-sniffer/skywalking-sdk-plugin/dubbo-plugin/src/test/java/com/a/eye/skywalking/plugin/dubbo/DubboInterceptorTest.java
@@ -80,7 +80,7 @@ public class DubboInterceptorTest {
         Mockito.when(RpcContext.getContext()).thenReturn(rpcContext);
         when(rpcContext.isConsumerSide()).thenReturn(true);
         when(methodInvokeContext.allArguments()).thenReturn(new Object[]{invoker, invocation});
-        Config.SkyWalking.APPLICATION_CODE = "DubboTestCases-APP";
+        Config.Agent.APPLICATION_CODE = "DubboTestCases-APP";
     }
 
 
@@ -155,7 +155,7 @@ public class DubboInterceptorTest {
     @Test
     public void testProviderWithAttachment() {
         when(rpcContext.isConsumerSide()).thenReturn(false);
-        when(rpcContext.getAttachment(DubboInterceptor.ATTACHMENT_NAME_OF_CONTEXT_DATA)).thenReturn("302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123");
+        when(rpcContext.getAttachment(DubboInterceptor.ATTACHMENT_NAME_OF_CONTEXT_DATA)).thenReturn("302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123|1");
 
         dubboInterceptor.beforeMethod(classInstanceContext, methodInvokeContext, methodInterceptResult);
         dubboInterceptor.afterMethod(classInstanceContext, methodInvokeContext, result);
@@ -168,7 +168,7 @@ public class DubboInterceptorTest {
         when(rpcContext.isConsumerSide()).thenReturn(false);
         when(BugFixActive.isActive()).thenReturn(true);
 
-        testParam.setTraceContext("302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123");
+        testParam.setTraceContext("302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123|1");
 
 
         dubboInterceptor.beforeMethod(classInstanceContext, methodInvokeContext, methodInterceptResult);
diff --git a/skywalking-sniffer/skywalking-sdk-plugin/httpClient-4.x-plugin/pom.xml b/skywalking-sniffer/skywalking-sdk-plugin/httpClient-4.x-plugin/pom.xml
index 4d13cff6b..03708288b 100644
--- a/skywalking-sniffer/skywalking-sdk-plugin/httpClient-4.x-plugin/pom.xml
+++ b/skywalking-sniffer/skywalking-sdk-plugin/httpClient-4.x-plugin/pom.xml
@@ -20,13 +20,6 @@
 	</properties>
 
 	<dependencies>
-		<dependency>
-			<groupId>com.a.eye</groupId>
-			<artifactId>skywalking-api</artifactId>
-			<version>${project.version}</version>
-		</dependency>
-		
-
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
diff --git a/skywalking-sniffer/skywalking-sdk-plugin/jdbc-plugin/pom.xml b/skywalking-sniffer/skywalking-sdk-plugin/jdbc-plugin/pom.xml
index db239652d..ebddf6e30 100755
--- a/skywalking-sniffer/skywalking-sdk-plugin/jdbc-plugin/pom.xml
+++ b/skywalking-sniffer/skywalking-sdk-plugin/jdbc-plugin/pom.xml
@@ -18,11 +18,6 @@
     </properties>
 
     <dependencies>
-        <dependency>
-            <groupId>com.a.eye</groupId>
-            <artifactId>skywalking-api</artifactId>
-            <version>3.0-2017</version>
-        </dependency>
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
diff --git a/skywalking-sniffer/skywalking-sdk-plugin/motan-plugin/src/test/java/com/a/eye/skywalking/plugin/motan/MotanProviderInterceptorTest.java b/skywalking-sniffer/skywalking-sdk-plugin/motan-plugin/src/test/java/com/a/eye/skywalking/plugin/motan/MotanProviderInterceptorTest.java
index 140bc34f4..e1a75e3a9 100644
--- a/skywalking-sniffer/skywalking-sdk-plugin/motan-plugin/src/test/java/com/a/eye/skywalking/plugin/motan/MotanProviderInterceptorTest.java
+++ b/skywalking-sniffer/skywalking-sdk-plugin/motan-plugin/src/test/java/com/a/eye/skywalking/plugin/motan/MotanProviderInterceptorTest.java
@@ -94,7 +94,7 @@ public class MotanProviderInterceptorTest {
     @Test
     public void testInvokerWithRefSegment() {
         HashMap attachments = new HashMap();
-        attachments.put("SWTraceContext", "302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123");
+        attachments.put("SWTraceContext", "302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123|1");
         when(request.getAttachments()).thenReturn(attachments);
 
         invokeInterceptor.beforeMethod(instanceContext, interceptorContext, null);
diff --git a/skywalking-sniffer/skywalking-sdk-plugin/tomcat-7.x-8.x-plugin/src/test/java/com/a/eye/skywalking/plugin/tomcat78x/TomcatInterceptorTest.java b/skywalking-sniffer/skywalking-sdk-plugin/tomcat-7.x-8.x-plugin/src/test/java/com/a/eye/skywalking/plugin/tomcat78x/TomcatInterceptorTest.java
index 6d2b4e38a..76f01259d 100644
--- a/skywalking-sniffer/skywalking-sdk-plugin/tomcat-7.x-8.x-plugin/src/test/java/com/a/eye/skywalking/plugin/tomcat78x/TomcatInterceptorTest.java
+++ b/skywalking-sniffer/skywalking-sdk-plugin/tomcat-7.x-8.x-plugin/src/test/java/com/a/eye/skywalking/plugin/tomcat78x/TomcatInterceptorTest.java
@@ -81,7 +81,7 @@ public class TomcatInterceptorTest {
 
     @Test
     public void testWithSerializedContextData() {
-        when(request.getHeader(TomcatInterceptor.HEADER_NAME_OF_CONTEXT_DATA)).thenReturn("302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123");
+        when(request.getHeader(TomcatInterceptor.HEADER_NAME_OF_CONTEXT_DATA)).thenReturn("302017.1487666919810.624424584.17332.1.1|1|REMOTE_APP|127.0.0.1|Trace.globalId.123|1");
 
         tomcatInterceptor.beforeMethod(classInstanceContext, methodInvokeContext, methodInterceptResult);
         tomcatInterceptor.afterMethod(classInstanceContext, methodInvokeContext, null);
diff --git a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/pom.xml b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/pom.xml
index d159c4e6b..cf91ccd65 100644
--- a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/pom.xml
+++ b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/pom.xml
@@ -12,11 +12,6 @@
     <artifactId>skywalking-toolkit-opentracing-activation</artifactId>
 
     <dependencies>
-        <dependency>
-            <groupId>com.a.eye</groupId>
-            <artifactId>skywalking-api</artifactId>
-            <version>${project.version}</version>
-        </dependency>
         <dependency>
             <groupId>com.a.eye</groupId>
             <artifactId>skywalking-toolkit-opentracing</artifactId>
diff --git a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/opentracing/span/interceptor/SpanSetTagInterceptor.java b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/opentracing/span/interceptor/SpanSetTagInterceptor.java
index 028ea37c6..e3a6e7ba9 100644
--- a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/opentracing/span/interceptor/SpanSetTagInterceptor.java
+++ b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-opentracing-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/opentracing/span/interceptor/SpanSetTagInterceptor.java
@@ -24,8 +24,10 @@ public class SpanSetTagInterceptor implements InstanceMethodsAroundInterceptor {
             ContextManager.activeSpan().setTag(key, (String)value);
         else if (value instanceof Boolean)
             ContextManager.activeSpan().setTag(key, (Boolean)value);
-        else if (value instanceof Number)
-            ContextManager.activeSpan().setTag(key, (Number)value);
+        else if (value instanceof Integer)
+            ContextManager.activeSpan().setTag(key, (Integer)value);
+        else
+            ContextManager.activeSpan().setTag(key, value.toString());
     }
 
     @Override
diff --git a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/pom.xml b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/pom.xml
index c78fd3771..fff2540da 100644
--- a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/pom.xml
+++ b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/pom.xml
@@ -12,11 +12,4 @@
     <packaging>jar</packaging>
 
     <name>skywalking-toolkit-trace-context-activation</name>
-    <dependencies>
-        <dependency>
-            <groupId>com.a.eye</groupId>
-            <artifactId>skywalking-api</artifactId>
-            <version>3.0-2017</version>
-        </dependency>
-    </dependencies>
 </project>
diff --git a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/trace/TraceContextInterceptor.java b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/trace/TraceContextInterceptor.java
index f3715e652..938d0e249 100644
--- a/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/trace/TraceContextInterceptor.java
+++ b/skywalking-sniffer/skywalking-toolkit-activation/skywalking-toolkit-trace-context-activation/src/main/java/com/a/eye/skywalking/toolkit/activation/trace/TraceContextInterceptor.java
@@ -24,9 +24,7 @@ public class TraceContextInterceptor implements StaticMethodsAroundInterceptor {
 
     @Override
     public Object afterMethod(StaticMethodInvokeContext interceptorContext, Object ret) {
-        ContextCarrier carrier = new ContextCarrier();
-        ContextManager.inject(carrier);
-       return carrier.getTraceSegmentId();
+       return ContextManager.getTraceSegmentId();
     }
 
     @Override