diff --git a/skywalking-api/src/main/java/com/ai/cloud/skywalking/model/ContextData.java b/skywalking-api/src/main/java/com/ai/cloud/skywalking/model/ContextData.java
index fbae131ce..5ad869d47 100644
--- a/skywalking-api/src/main/java/com/ai/cloud/skywalking/model/ContextData.java
+++ b/skywalking-api/src/main/java/com/ai/cloud/skywalking/model/ContextData.java
@@ -23,11 +23,11 @@ public class ContextData {
     public ContextData(String contextDataStr) {
         // 反序列化参数
         String[] value = contextDataStr.split("-");
-        if(value == null || value.length != 4){
-        	throw new IllegalArgumentException("illegal context data.");
+        if (value == null || value.length != 4) {
+            throw new IllegalArgumentException("illegal context data.");
         }
         this.traceId = value[0];
-        this.parentLevel = value[1];
+        this.parentLevel = value[1].trim();
         this.levelId = Integer.valueOf(value[2]);
         this.spanType = value[3];
 
@@ -51,6 +51,18 @@ public class ContextData {
 
     @Override
     public String toString() {
-        return traceId + "-" + parentLevel + "-" + levelId + "-" + spanType;
+        StringBuilder stringBuilder = new StringBuilder();
+        stringBuilder.append(traceId);
+        stringBuilder.append("-");
+        if (parentLevel != null && parentLevel.length() > 0) {
+            stringBuilder.append(" ");
+        } else {
+            stringBuilder.append(parentLevel);
+        }
+        stringBuilder.append("-");
+        stringBuilder.append(levelId);
+        stringBuilder.append("-");
+        stringBuilder.append(spanType);
+        return stringBuilder.toString();
     }
 }