diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanNode.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanNode.java
index 3110891d5..43a4183ee 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanNode.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanNode.java
@@ -1,5 +1,8 @@
 package com.ai.cloud.skywalking.analysis.chainbuild.entity;
 
+import java.util.List;
+
+import com.ai.cloud.skywalking.analysis.chainbuild.exception.TraceSpanTreeSerializeException;
 import com.ai.cloud.skywalking.analysis.chainbuild.util.StringUtil;
 import com.ai.cloud.skywalking.protocol.CallType;
 import com.ai.cloud.skywalking.protocol.Span;
@@ -13,6 +16,16 @@ public class TraceSpanNode {
 	
 	protected TraceSpanNode sub = null;
 	
+	protected String prevNodeRefToken = null;
+	
+	protected String nextNodeRefToken = null;
+	
+	protected String parentNodeRefToken = null;
+	
+	protected String subNodeRefToken = null;
+	
+	protected String nodeRefToken = null;
+	
 	protected boolean visualNode = true;
 	
 	protected String parentLevel;
@@ -57,8 +70,8 @@ public class TraceSpanNode {
      */
 	protected String applicationId = ""; 
 	
-	public TraceSpanNode(TraceSpanNode parent, TraceSpanNode sub, TraceSpanNode prev, TraceSpanNode next, Span span) {
-		this(parent, sub, prev, next);
+	public TraceSpanNode(TraceSpanNode parent, TraceSpanNode sub, TraceSpanNode prev, TraceSpanNode next, Span span, List<TraceSpanNode> spanContainer) {
+		this(parent, sub, prev, next, spanContainer);
 		this.visualNode = false;
 		this.parentLevel = span.getParentLevel();
 		this.levelId = span.getLevelId();
@@ -75,30 +88,33 @@ public class TraceSpanNode {
 		this.spanType = span.getSpanType();
 		this.businessKey = span.getBusinessKey();
 		this.applicationId = span.getApplicationId();
+		
+		//TODO: to set nodeToken
 	}
 	
-	public TraceSpanNode(TraceSpanNode parent, TraceSpanNode sub, TraceSpanNode prev, TraceSpanNode next){
+	protected TraceSpanNode(TraceSpanNode parent, TraceSpanNode sub, TraceSpanNode prev, TraceSpanNode next, List<TraceSpanNode> spanContainer){
 		this.visualNode = true;
-		this.parent = parent;
+		this.setParent(parent);
 		if(parent != null){
-			parent.sub = this;
+			parent.setSub(this);
 		}
-		this.sub = sub;
+		this.setSub(sub);
 		if(sub != null){
-			sub.parent = this;
+			sub.setParent(this);
 		}
-		this.prev = prev;
+		this.setPrev(prev);
 		if(prev != null){
-			prev.next = this;
+			prev.setNext(this);
 		}
-		this.next = next;
+		this.setNext(next);
 		if(next != null){
-			next.prev = this;
+			next.setPrev(this);
 		}
+		spanContainer.add(this);
 	}
 	
-	protected TraceSpanNode(TraceSpanNode parent, TraceSpanNode sub, TraceSpanNode prev, TraceSpanNode next, String parentLevelId, int levelId){
-		this(parent, sub, prev, next);
+	protected TraceSpanNode(TraceSpanNode parent, TraceSpanNode sub, TraceSpanNode prev, TraceSpanNode next, String parentLevelId, int levelId, List<TraceSpanNode> spanContainer){
+		this(parent, sub, prev, next, spanContainer);
 		this.parentLevel = parentLevelId;
 		this.levelId = levelId;
 		this.callTimes = 0;
@@ -134,30 +150,38 @@ public class TraceSpanNode {
 		}
 	}
 	
-	TraceSpanNode next(){
-		return this.next;
-	}
-	
-	TraceSpanNode sub(){
-		return this.sub;
-	}
-
-	public TraceSpanNode getPrev() {
+	public TraceSpanNode prev() {
 		return prev;
 	}
 
-	public TraceSpanNode getNext() {
+	public TraceSpanNode next() {
 		return next;
 	}
 
-	public TraceSpanNode getParent() {
+	public TraceSpanNode parent() {
 		return parent;
 	}
 
-	public TraceSpanNode getSub() {
+	public TraceSpanNode sub() {
 		return sub;
 	}
 
+	public void setPrev(TraceSpanNode prev) {
+		this.prev = prev;
+	}
+
+	public void setNext(TraceSpanNode next) {
+		this.next = next;
+	}
+
+	public void setParent(TraceSpanNode parent) {
+		this.parent = parent;
+	}
+
+	public void setSub(TraceSpanNode sub) {
+		this.sub = sub;
+	}
+
 	public boolean isVisualNode() {
 		return visualNode;
 	}
@@ -197,4 +221,26 @@ public class TraceSpanNode {
 	public String getApplicationId() {
 		return applicationId;
 	}
+	
+	public String getNodeRefToken() throws TraceSpanTreeSerializeException {
+		if(StringUtil.isBlank(nodeRefToken)){
+			throw new TraceSpanTreeSerializeException("parentLevel=" + parentLevel + ", levelId=" + levelId + ", viewPointId=" + viewPointId + ", node ref token is null.");
+		}
+		return nodeRefToken;
+	}
+
+	void serializeRef() throws TraceSpanTreeSerializeException{
+		if(prev != null){
+			prevNodeRefToken = prev.getNodeRefToken();
+		}
+		if(parent != null){
+			parentNodeRefToken = parent.getNodeRefToken();
+		}
+		if(next != null){
+			nextNodeRefToken = next.getNodeRefToken();
+		}
+		if(sub != null){
+			subNodeRefToken = sub.getNodeRefToken();
+		}
+	}
 }
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanTree.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanTree.java
index e7a1d7d4b..0d0841381 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanTree.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/TraceSpanTree.java
@@ -1,5 +1,6 @@
 package com.ai.cloud.skywalking.analysis.chainbuild.entity;
 
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
@@ -8,6 +9,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.ai.cloud.skywalking.analysis.chainbuild.exception.BuildTraceSpanTreeException;
+import com.ai.cloud.skywalking.analysis.chainbuild.exception.TraceSpanTreeSerializeException;
 import com.ai.cloud.skywalking.analysis.chainbuild.util.StringUtil;
 import com.ai.cloud.skywalking.analysis.chainbuild.util.TokenGenerator;
 import com.ai.cloud.skywalking.protocol.Span;
@@ -20,6 +22,8 @@ public class TraceSpanTree {
 	private String cid;
 
 	private TraceSpanNode treeRoot;
+	
+	private List<TraceSpanNode> spanContainer = new ArrayList<TraceSpanNode>();
 
 	public TraceSpanTree() {
 	}
@@ -40,7 +44,7 @@ public class TraceSpanTree {
 			}
 		});
 		cid = generateChainToken(spanList.get(0));
-		treeRoot = new TraceSpanNode(null, null, null, null, spanList.get(0));
+		treeRoot = new TraceSpanNode(null, null, null, null, spanList.get(0), spanContainer);
 		if (spanList.size() > 1) {
 			for (int i = 1; i < spanList.size(); i++) {
 				this.build(spanList.get(i));
@@ -65,7 +69,7 @@ public class TraceSpanTree {
 			TraceSpanNode foundNode = findNodeAndCreateVisualNodeIfNess(
 					span.getParentLevel(), span.getLevelId() - 1);
 			if (foundNode != null) {
-				new TraceSpanNode(null, null, foundNode, foundNode.next(), span);
+				new TraceSpanNode(null, null, foundNode, foundNode.next(), span, spanContainer);
 			}
 		} else {
 			/**
@@ -101,7 +105,7 @@ public class TraceSpanTree {
 				} else {
 					// create visual next node
 					currentNode = new VisualTraceSpanNode(null, null,
-							currentNode, null, contextParentLevelId, i);
+							currentNode, null, contextParentLevelId, i, spanContainer);
 				}
 			}
 			contextParentLevelId = contextParentLevelId == "" ? ("" + currentLevelInt)
@@ -111,7 +115,7 @@ public class TraceSpanTree {
 			} else {
 				// create visual sub node
 				currentNode = new VisualTraceSpanNode(currentNode, null, null,
-						null, contextParentLevelId, 0);
+						null, contextParentLevelId, 0, spanContainer);
 			}
 		}
 
@@ -130,5 +134,12 @@ public class TraceSpanTree {
 					+ level0Span.getTraceId() + " level0 span data is illegal");
 		}
 	}
+	
+	
+	private void beforeSerialize() throws TraceSpanTreeSerializeException{
+		for(TraceSpanNode treeNode : spanContainer){
+			treeNode.serializeRef();
+		}
+	}
 
 }
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/VisualTraceSpanNode.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/VisualTraceSpanNode.java
index d1ce42fec..6d155f528 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/VisualTraceSpanNode.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/entity/VisualTraceSpanNode.java
@@ -1,11 +1,15 @@
 package com.ai.cloud.skywalking.analysis.chainbuild.entity;
 
+import java.util.List;
+
 public class VisualTraceSpanNode extends TraceSpanNode {
 
 	protected VisualTraceSpanNode(TraceSpanNode parent, TraceSpanNode sub,
 			TraceSpanNode prev, TraceSpanNode next, String parentLevelId,
-			int levelId) {
-		super(parent, sub, prev, next, parentLevelId, levelId);
+			int levelId, List<TraceSpanNode> spanContainer) {
+		super(parent, sub, prev, next, parentLevelId, levelId, spanContainer);
+		
+		//TODO: to set nodeToken
 	}
 
 
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/exception/TraceSpanTreeSerializeException.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/exception/TraceSpanTreeSerializeException.java
new file mode 100644
index 000000000..5f0bdd9e0
--- /dev/null
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/chainbuild/exception/TraceSpanTreeSerializeException.java
@@ -0,0 +1,13 @@
+package com.ai.cloud.skywalking.analysis.chainbuild.exception;
+
+public class TraceSpanTreeSerializeException extends Exception {
+	private static final long serialVersionUID = 7857716041262993579L;
+
+	public TraceSpanTreeSerializeException(String msg){
+		super(msg);
+	}
+	
+	public TraceSpanTreeSerializeException(String msg, Exception cause){
+		super(msg, cause);
+	}
+}