diff --git a/skywalking-sniffer/skywalking-sniffer-mock/pom.xml b/skywalking-sniffer/skywalking-sniffer-mock/pom.xml
index b18693f11..0c9310acf 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/pom.xml
+++ b/skywalking-sniffer/skywalking-sniffer-mock/pom.xml
@@ -9,7 +9,7 @@
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>skywalking-sniffer-mock</artifactId>
-    <description>This is a sniffer mock module, test for test-dependency, only.</description>
+    <description>This is a sniffer mock module. Simulate a sniffer, assemble one or more trace segments. Test-dependency, only.</description>
 
     <dependencies>
         <dependency>
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java
index f13b49a8f..3407ec21d 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java
@@ -2,9 +2,11 @@ package com.a.eye.skywalking.sniffer.mock.trace;
 
 import com.a.eye.skywalking.api.context.TracerContext;
 import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.DubboServerMysqlTraceBuilder;
 import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.SingleTomcat200TraceBuilder;
 import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.SingleTomcat404TraceBuilder;
 import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.SingleTomcat500TraceBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.TomcatDubboClientTraceBuilder;
 import com.a.eye.skywalking.trace.TraceSegment;
 
 /**
@@ -19,7 +21,6 @@ public enum TraceSegmentBuilderFactory {
     /**
      * @see {@link SingleTomcat200TraceBuilder}
      *
-     * @return
      */
     public TraceSegment singleTomcat200Trace(){
        return this.build(SingleTomcat200TraceBuilder.INSTANCE);
@@ -28,7 +29,6 @@ public enum TraceSegmentBuilderFactory {
     /**
      * @see {@link SingleTomcat404TraceBuilder}
      *
-     * @return
      */
     public TraceSegment singleTomcat404Trace(){
         return this.build(SingleTomcat404TraceBuilder.INSTANCE);
@@ -37,12 +37,25 @@ public enum TraceSegmentBuilderFactory {
     /**
      * @see {@link SingleTomcat500TraceBuilder}
      *
-     * @return
      */
     public TraceSegment singleTomcat500Trace(){
         return this.build(SingleTomcat500TraceBuilder.INSTANCE);
     }
 
+    /**
+     * @see {@link TomcatDubboClientTraceBuilder}
+     */
+    public TraceSegment traceOf_Tomcat_DubboClient(){
+        return this.build(TomcatDubboClientTraceBuilder.INSTANCE);
+    }
+
+    /**
+     * @see {@link DubboServerMysqlTraceBuilder}
+     */
+    public TraceSegment traceOf_DubboServer_MySQL() {
+        return this.build(DubboServerMysqlTraceBuilder.INSTANCE);
+    }
+
     private TraceSegment build(TraceSegmentBuilder builder){
         MockTracerContextListener listener = new MockTracerContextListener();
         try{
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/DubboSpanGenerator.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/DubboSpanGenerator.java
new file mode 100644
index 000000000..fdba25e7a
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/DubboSpanGenerator.java
@@ -0,0 +1,44 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.span;
+
+import com.a.eye.skywalking.api.context.ContextManager;
+import com.a.eye.skywalking.trace.Span;
+import com.a.eye.skywalking.trace.tag.Tags;
+
+/**
+ * The <code>DubboSpanGenerator</code> generates all possible spans, by tracing Dubbo rpc.
+ * Including client/server side span.
+ *
+ * @author wusheng
+ */
+public class DubboSpanGenerator {
+    public static class Client extends SpanGeneration{
+        @Override protected void before() {
+            Span span = ContextManager.INSTANCE.createSpan("/default_rpc/com.a.eye.skywalking.test.persistence.PersistenceService.query");
+            Tags.COMPONENT.set(span, "Dubbo");
+            Tags.URL.set(span, "rest://192.168.1.8:20880/default_rpc/com.a.eye.skywalking.test.persistence.PersistenceService.query(String)");
+            Tags.SPAN_KIND.set(span, Tags.SPAN_KIND_SERVER);
+            Tags.PEER_HOST.set(span, "192.168.1.8");
+            Tags.PEER_PORT.set(span, 20880);
+            Tags.SPAN_LAYER.asHttp(span);
+        }
+
+        @Override protected void after() {
+            ContextManager.INSTANCE.stopSpan();
+        }
+    }
+
+    public static class Server extends SpanGeneration{
+        @Override protected void before() {
+            Span span = ContextManager.INSTANCE.createSpan("/default_rpc/com.a.eye.skywalking.test.persistence.PersistenceService.query");
+            Tags.COMPONENT.set(span, "Dubbo");
+            Tags.URL.set(span, "rest://192.168.1.8:20880/default_rpc/com.a.eye.skywalking.test.persistence.PersistenceService.query(String)");
+            Tags.SPAN_KIND.set(span, Tags.SPAN_KIND_CLIENT);
+            Tags.PEER_HOST.set(span, "10.21.9.35");
+            Tags.SPAN_LAYER.asHttp(span);
+        }
+
+        @Override protected void after() {
+            ContextManager.INSTANCE.stopSpan();
+        }
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/MySQLGenerator.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/MySQLGenerator.java
new file mode 100644
index 000000000..78097f919
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/MySQLGenerator.java
@@ -0,0 +1,30 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.span;
+
+import com.a.eye.skywalking.api.context.ContextManager;
+import com.a.eye.skywalking.trace.Span;
+import com.a.eye.skywalking.trace.tag.Tags;
+
+/**
+ * The <code>MySQLGenerator</code> generates all possible spans, by tracing mysql client access.
+ *
+ * @author wusheng
+ */
+public class MySQLGenerator {
+    public static class Query extends SpanGeneration {
+        @Override protected void before() {
+            Span span = ContextManager.INSTANCE.createSpan("mysql/jdbi/statement/executeQuery");
+            Tags.COMPONENT.set(span, "Mysql");
+            Tags.SPAN_KIND.set(span, Tags.SPAN_KIND_CLIENT);
+            Tags.PEER_HOST.set(span, "10.5.34.18");
+            Tags.PEER_PORT.set(span, 30088);
+            Tags.DB_INSTANCE.set(span, "mysql-instance");
+            Tags.DB_STATEMENT.set(span, "select * from users where user_id = 1");
+            Tags.DB_TYPE.set(span, "sql");
+            Tags.SPAN_LAYER.asDB(span);
+        }
+
+        @Override protected void after() {
+            ContextManager.INSTANCE.stopSpan();
+        }
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/SpanGeneration.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/SpanGeneration.java
index 099c7469b..e148a3de0 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/SpanGeneration.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/SpanGeneration.java
@@ -1,18 +1,20 @@
 package com.a.eye.skywalking.sniffer.mock.trace.builders.span;
 
 /**
- * Created by wusheng on 2017/2/28.
+ * The <code>SpanGeneration</code> implementations can generate several kinds of spans.
+ *
+ * @author wusheng
  */
 public abstract class SpanGeneration {
-    private SpanGeneration next;
+    private SpanGeneration[] next;
 
     public SpanGeneration build(SpanGeneration next){
-        this.next = next;
+        this.next = new SpanGeneration[]{next};
         return next;
     }
 
-    public SpanGeneration build(){
-        return this;
+    public void build(SpanGeneration... next){
+        this.next = next;
     }
 
     protected abstract void before();
@@ -22,7 +24,9 @@ public abstract class SpanGeneration {
     public void generate(){
         this.before();
         if(next != null){
-            next.generate();
+            for (SpanGeneration generation : next) {
+                generation.generate();
+            }
         }
         this.after();
     }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/TomcatSpanGenerator.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/TomcatSpanGenerator.java
index 78b69ed56..5a37ba71f 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/TomcatSpanGenerator.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/TomcatSpanGenerator.java
@@ -15,9 +15,12 @@ public class TomcatSpanGenerator{
 
         @Override protected void before() {
             Span webSpan = ContextManager.INSTANCE.createSpan("/web/serviceA");
-            Tags.COMPONENT.set(webSpan, "tomcat");
+            Tags.COMPONENT.set(webSpan, "Tomcat");
             Tags.URL.set(webSpan, "http://10.21.9.35/web/serviceA");
             Tags.SPAN_KIND.set(webSpan, Tags.SPAN_KIND_SERVER);
+            Tags.PEER_HOST.set(webSpan, "10.21.9.35");
+            Tags.PEER_PORT.set(webSpan, 80);
+            Tags.SPAN_LAYER.asHttp(webSpan);
         }
 
         @Override protected void after() {
@@ -32,9 +35,12 @@ public class TomcatSpanGenerator{
 
         @Override protected void before() {
             Span webSpan = ContextManager.INSTANCE.createSpan("/web/service/unknown");
-            Tags.COMPONENT.set(webSpan, "tomcat");
+            Tags.COMPONENT.set(webSpan, "Tomcat");
             Tags.URL.set(webSpan, "http://10.21.9.35/web/unknown");
             Tags.SPAN_KIND.set(webSpan, Tags.SPAN_KIND_SERVER);
+            Tags.PEER_HOST.set(webSpan, "10.21.9.35");
+            Tags.PEER_PORT.set(webSpan, 80);
+            Tags.SPAN_LAYER.asHttp(webSpan);
         }
 
         @Override protected void after() {
@@ -49,9 +55,12 @@ public class TomcatSpanGenerator{
 
         @Override protected void before() {
             Span webSpan = ContextManager.INSTANCE.createSpan("/web/error/service");
-            Tags.COMPONENT.set(webSpan, "tomcat");
+            Tags.COMPONENT.set(webSpan, "Tomcat");
             Tags.URL.set(webSpan, "http://10.21.9.35/web/error/service");
             Tags.SPAN_KIND.set(webSpan, Tags.SPAN_KIND_SERVER);
+            Tags.PEER_HOST.set(webSpan, "10.21.9.35");
+            Tags.PEER_PORT.set(webSpan, 80);
+            Tags.SPAN_LAYER.asHttp(webSpan);
         }
 
         @Override protected void after() {
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/DubboServerMysqlTraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/DubboServerMysqlTraceBuilder.java
new file mode 100644
index 000000000..c5f14b58d
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/DubboServerMysqlTraceBuilder.java
@@ -0,0 +1,21 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.trace;
+
+import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
+import com.a.eye.skywalking.sniffer.mock.trace.TraceSegmentBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.span.DubboSpanGenerator;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.span.MySQLGenerator;
+import com.a.eye.skywalking.trace.TraceSegment;
+
+/**
+ * @author wusheng
+ */
+public enum DubboServerMysqlTraceBuilder implements TraceSegmentBuilder {
+    INSTANCE;
+
+    @Override public TraceSegment build(MockTracerContextListener listener) {
+        DubboSpanGenerator.Server rootSpan = new DubboSpanGenerator.Server();
+        rootSpan.build(new MySQLGenerator.Query());
+        rootSpan.generate();
+        return listener.getFinished(0);
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat200TraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat200TraceBuilder.java
index 5b827f701..56b227417 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat200TraceBuilder.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat200TraceBuilder.java
@@ -14,7 +14,7 @@ public enum SingleTomcat200TraceBuilder implements TraceSegmentBuilder {
     INSTANCE;
 
     @Override public TraceSegment build(MockTracerContextListener listener) {
-        TomcatSpanGenerator.ON200.INSTANCE.build().generate();
+        TomcatSpanGenerator.ON200.INSTANCE.generate();
         return listener.getFinished(0);
     }
 }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat404TraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat404TraceBuilder.java
index 6000fb1b6..d1998e100 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat404TraceBuilder.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat404TraceBuilder.java
@@ -14,7 +14,7 @@ public enum SingleTomcat404TraceBuilder implements TraceSegmentBuilder {
     INSTANCE;
 
     @Override public TraceSegment build(MockTracerContextListener listener) {
-        TomcatSpanGenerator.ON404.INSTANCE.build().generate();
+        TomcatSpanGenerator.ON404.INSTANCE.generate();
         return listener.getFinished(0);
     }
 }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat500TraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat500TraceBuilder.java
index 5251f45f9..2f7d8ec92 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat500TraceBuilder.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat500TraceBuilder.java
@@ -14,7 +14,7 @@ public enum SingleTomcat500TraceBuilder implements TraceSegmentBuilder {
     INSTANCE;
 
     @Override public TraceSegment build(MockTracerContextListener listener) {
-        TomcatSpanGenerator.ON500.INSTANCE.build().generate();
+        TomcatSpanGenerator.ON500.INSTANCE.generate();
         return listener.getFinished(0);
     }
 }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/TomcatDubboClientTraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/TomcatDubboClientTraceBuilder.java
new file mode 100644
index 000000000..8ce8b718b
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/TomcatDubboClientTraceBuilder.java
@@ -0,0 +1,25 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.trace;
+
+import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
+import com.a.eye.skywalking.sniffer.mock.trace.TraceSegmentBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.span.DubboSpanGenerator;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.span.TomcatSpanGenerator;
+import com.a.eye.skywalking.trace.TraceSegment;
+
+/**
+ * A Trace segment contains two spans with ChildOf relations,
+ * the parent is a Tomcat span,
+ * the child is a Dubbo client span.
+ *
+ * @author wusheng
+ */
+public enum TomcatDubboClientTraceBuilder implements TraceSegmentBuilder {
+    INSTANCE;
+
+    @Override public TraceSegment build(MockTracerContextListener listener) {
+        TomcatSpanGenerator.ON200 rootSpan = new TomcatSpanGenerator.ON200();
+        rootSpan.build(new DubboSpanGenerator.Client());
+        rootSpan.generate();
+        return listener.getFinished(0);
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/test/java/com/a/eye/skywalking/sniffer/mock/MockTracerContextListenerTestCase.java b/skywalking-sniffer/skywalking-sniffer-mock/src/test/java/com/a/eye/skywalking/sniffer/mock/MockTracerContextListenerTestCase.java
index ce43770c8..83f1d34b4 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/test/java/com/a/eye/skywalking/sniffer/mock/MockTracerContextListenerTestCase.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/test/java/com/a/eye/skywalking/sniffer/mock/MockTracerContextListenerTestCase.java
@@ -49,4 +49,18 @@ public class MockTracerContextListenerTestCase {
         listener.clear();
         listener.assertValidIndex(0);
     }
+
+    @Test
+    public void testTraceOf_Tomcat_DubboClient(){
+        TraceSegment segment = TraceSegmentBuilderFactory.INSTANCE.traceOf_Tomcat_DubboClient();
+
+        Assert.assertEquals(2, segment.getSpans().size());
+    }
+
+    @Test
+    public void testTraceOf_DubboServer_MySQL(){
+        TraceSegment segment = TraceSegmentBuilderFactory.INSTANCE.traceOf_DubboServer_MySQL();
+
+        Assert.assertEquals(2, segment.getSpans().size());
+    }
 }