diff --git a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/BufferGroup.java b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/BufferGroup.java
index 1fa4634f4..574fb793c 100644
--- a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/BufferGroup.java
+++ b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/BufferGroup.java
@@ -5,11 +5,15 @@ import com.ai.cloud.skywalking.conf.Constants;
 import com.ai.cloud.skywalking.logging.LogManager;
 import com.ai.cloud.skywalking.logging.Logger;
 import com.ai.cloud.skywalking.protocol.Span;
+import com.ai.cloud.skywalking.protocol.common.ISerializable;
 import com.ai.cloud.skywalking.selfexamination.HeathReading;
 import com.ai.cloud.skywalking.selfexamination.SDKHealthCollector;
 import com.ai.cloud.skywalking.sender.DataSenderFactoryWithBalance;
 import com.ai.cloud.skywalking.util.AtomicRangeInteger;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import static com.ai.cloud.skywalking.conf.Config.Buffer.BUFFER_MAX_SIZE;
 import static com.ai.cloud.skywalking.conf.Config.Consumer.*;
 
@@ -17,7 +21,7 @@ public class BufferGroup {
     private static Logger logger = LogManager.getLogger(BufferGroup.class);
     private String groupName;
     //注意： 修改这个变量名，需要修改test-api工程的Config类中的SPAN_ARRAY_FIELD_NAME变量
-    private Span[] dataBuffer = new Span[BUFFER_MAX_SIZE];
+    private ISerializable[] dataBuffer = new ISerializable[BUFFER_MAX_SIZE];
     AtomicRangeInteger index = new AtomicRangeInteger(0, BUFFER_MAX_SIZE);
 
     public BufferGroup(String groupName) {
@@ -65,7 +69,8 @@ public class BufferGroup {
 
         @Override
         public void run() {
-            StringBuilder data = new StringBuilder();
+            //TODO: 根据list长度进行限制
+            List<ISerializable> packageData = new ArrayList<ISerializable>();
             while (true) {
                 boolean bool = false;
                 try {
diff --git a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/ContextBuffer.java b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/ContextBuffer.java
index ad14db047..c4e1e6b2d 100644
--- a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/ContextBuffer.java
+++ b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/buffer/ContextBuffer.java
@@ -3,6 +3,7 @@ package com.ai.cloud.skywalking.buffer;
 import com.ai.cloud.skywalking.logging.LogManager;
 import com.ai.cloud.skywalking.logging.Logger;
 import com.ai.cloud.skywalking.protocol.Span;
+import com.ai.cloud.skywalking.protocol.common.ISerializable;
 
 import java.util.concurrent.ThreadLocalRandom;
 
@@ -18,9 +19,9 @@ public class ContextBuffer {
         //non
     }
 
-    public static void save(Span span) {
+    public static void save(ISerializable data) {
     	try{
-    		pool.save(span);
+    		pool.save(data);
     	}catch(Throwable t){
     		logger.error("save span error.", t);
     	}
@@ -36,8 +37,8 @@ public class ContextBuffer {
             }
         }
 
-        public void save(Span span) {
-            bufferGroups[ThreadLocalRandom.current().nextInt(0, POOL_SIZE)].save(span);
+        public void save(ISerializable data) {
+            bufferGroups[ThreadLocalRandom.current().nextInt(0, POOL_SIZE)].save(data);
         }
 
     }
diff --git a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java
index 79c5128de..f1b56f3c3 100644
--- a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java
+++ b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java
@@ -1,5 +1,6 @@
 package com.ai.cloud.skywalking.sender;
 
+import com.ai.cloud.skywalking.protocol.common.ISerializable;
 import io.netty.bootstrap.Bootstrap;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandlerContext;
@@ -18,6 +19,7 @@ import io.netty.handler.codec.bytes.ByteArrayEncoder;
 
 import java.io.IOException;
 import java.net.InetSocketAddress;
+import java.util.List;
 
 import com.ai.cloud.skywalking.selfexamination.HeathReading;
 import com.ai.cloud.skywalking.selfexamination.SDKHealthCollector;
@@ -72,7 +74,7 @@ public class DataSender implements IDataSender {
      * @return
      */
     @Override
-    public boolean send(String data) {
+    public boolean send(List<ISerializable> packageData) {
         try {
             if (channel != null && channel.isActive()) {
 
diff --git a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderWithCopies.java b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderWithCopies.java
index c9ec369cd..c562ee002 100644
--- a/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderWithCopies.java
+++ b/skywalking-collector/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderWithCopies.java
@@ -3,8 +3,10 @@ package com.ai.cloud.skywalking.sender;
 import static com.ai.cloud.skywalking.conf.Config.Sender.MAX_COPY_NUM;
 
 import java.util.HashSet;
+import java.util.List;
 import java.util.Set;
 
+import com.ai.cloud.skywalking.protocol.common.ISerializable;
 import com.ai.cloud.skywalking.selfexamination.HeathReading;
 import com.ai.cloud.skywalking.selfexamination.SDKHealthCollector;
 
@@ -48,7 +50,7 @@ public class DataSenderWithCopies implements IDataSender {
 	/**
 	 * 尝试向所有副本发送
 	 */
-	public boolean send(String data) {
+	public boolean send(List<ISerializable> packageData) {
 		int successNum = 0;
 		for (IDataSender sender : senders) {
 			if (sender.send(data)) {
diff --git a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/AckSpan.java b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/AckSpan.java
index 8fa9dbae6..26ef3bbdf 100644
--- a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/AckSpan.java
+++ b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/AckSpan.java
@@ -9,33 +9,33 @@ public class AckSpan extends AbstractDataSerializable {
     /**
      * tid，调用链的全局唯一标识
      */
-    protected String traceId;
+    private String traceId;
     /**
      * 当前调用链的上级描述<br/>
      * 如当前序号为：0.1.0时，parentLevel=0.1
      */
-    protected String parentLevel;
+    private String parentLevel;
     /**
      * 当前调用链的本机描述<br/>
      * 如当前序号为：0.1.0时，levelId=0
      */
-    protected int levelId = 0;
+    private int levelId = 0;
     /**
      * 节点调用花费时间
      */
-    protected long cost = 0L;
+    private long cost = 0L;
     /**
      * 节点调用的状态<br/>
      * 0：成功<br/>
      * 1：异常<br/>
      * 异常判断原则：代码产生exception，并且此exception不在忽略列表中
      */
-    protected byte statusCode = 0;
+    private byte statusCode = 0;
     /**
      * 节点调用的错误堆栈<br/>
      * 堆栈以JAVA的exception为主要判断依据
      */
-    protected String exceptionStack;
+    private String exceptionStack;
 
     public String getTraceId() {
         return traceId;
diff --git a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/RequestSPan.java b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/RequestSPan.java
index 61f2983ff..70b6781e6 100644
--- a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/RequestSPan.java
+++ b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/RequestSPan.java
@@ -4,6 +4,9 @@ import com.ai.cloud.skywalking.protocol.common.AbstractDataSerializable;
 import com.ai.cloud.skywalking.protocol.common.CallType;
 import com.ai.cloud.skywalking.protocol.common.SpanType;
 
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * Created by wusheng on 16/7/4.
  */
@@ -11,66 +14,69 @@ public class RequestSpan extends AbstractDataSerializable {
     /**
      * tid，调用链的全局唯一标识
      */
-    protected String traceId;
+    private String traceId;
     /**
      * 当前调用链的上级描述<br/>
      * 如当前序号为：0.1.0时，parentLevel=0.1
      */
-    protected String parentLevel;
+    private String parentLevel;
     /**
      * 当前调用链的本机描述<br/>
      * 如当前序号为：0.1.0时，levelId=0
      */
-    protected int levelId = 0;
+    private int levelId = 0;
     /**
      * 调用链中单个节点的入口描述<br/>
      * 如：java方法名，调用的RPC地址等等
      */
-    protected String viewPointId = "";
+    private String viewPointId = "";
     /**
      * 节点调用开始时间
      */
-    protected long startDate = System.currentTimeMillis();
+    private long startDate = System.currentTimeMillis();
     /**
      * 节点调用的发生机器描述<br/>
      * 包含机器名 + IP地址
      */
-    protected String address = "";
+    private String address = "";
 
     /**
      * 节点类型描述<br/>
      * 已字符串的形式描述<br/>
      * 如：java,dubbo等
      */
-    protected String spanTypeDesc = "";
+    private String spanTypeDesc = "";
 
     /**
      * 节点调用类型描述<br/>
+     *
      * @see CallType
      */
-    protected String callType = "";
+    private String callType = "";
 
     /**
      * 节点分布式类型<br/>
      * 本地调用 / RPC服务端 / RPC客户端
      */
-    protected SpanType spanType = SpanType.LOCAL;
+    private SpanType spanType = SpanType.LOCAL;
 
     /**
      * 节点调用的所在进程号
      */
-    protected String processNo = "";
+    private String processNo = "";
     /**
      * 节点调用所在的系统逻辑名称<br/>
      * 由授权文件指定
      */
-    protected String applicationId = "";
+    private String applicationId = "";
 
     /**
      * 用户id<br/>
      * 由授权文件指定
      */
-    protected String userId;
+    private String userId;
+
+    private Map<String, String> paramters = new HashMap<String, String>();
 
     public String getTraceId() {
         return traceId;
@@ -168,6 +174,14 @@ public class RequestSpan extends AbstractDataSerializable {
         this.userId = userId;
     }
 
+    public Map<String, String> getParamters() {
+        return paramters;
+    }
+
+    public void setParamters(Map<String, String> paramters) {
+        this.paramters = paramters;
+    }
+
     @Override
     public int getDataType() {
         return 1;
diff --git a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/common/AbstractDataSerializable.java b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/common/AbstractDataSerializable.java
index 4df3469fe..619d0bab8 100644
--- a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/common/AbstractDataSerializable.java
+++ b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/protocol/common/AbstractDataSerializable.java
@@ -21,11 +21,18 @@ public abstract class AbstractDataSerializable implements ISerializable, Nullabl
 
     public abstract byte[] getData();
 
+    /**
+     * 消息包结构:
+     * 4位消息体类型
+     * n位数据正文
+     *
+     * @return
+     */
     @Override
     public byte[] convert2Bytes() {
         byte[] type = IntegerAssist.intToBytes(SerializableDataTypeRegister.getType(this.getClass()));
 
-        //TODO:类型+ data = 消息包
+        //TODO:消息包 = 4位
         return getData();
     }
 
diff --git a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/util/TransportPackager.java b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/util/TransportPackager.java
index 2eb326411..2a9ad6861 100644
--- a/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/util/TransportPackager.java
+++ b/skywalking-collector/skywalking-protocol/src/main/java/com/ai/cloud/skywalking/util/TransportPackager.java
@@ -1,9 +1,12 @@
 package com.ai.cloud.skywalking.util;
 
+import com.ai.cloud.skywalking.protocol.common.ISerializable;
+
 import java.util.Arrays;
+import java.util.List;
 
 public class TransportPackager {
-    public static byte[] pack(byte[] data) {
+    public static byte[] pack(List<ISerializable> packageData) {
         // 对协议格式进行修改
         // | check sum(4 byte) |  data
         byte[] dataPackage = new byte[data.length + 4];
@@ -24,7 +27,7 @@ public class TransportPackager {
     }
 
 
-    public static byte[] unpack(byte[] dataPackage) {
+    public static List<ISerializable> unpack(byte[] dataPackage) {
         if (validateCheckSum(dataPackage)) {
             return unpackDataText(dataPackage);
         } else {