diff --git a/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinConsumerDelegate.java b/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinConsumerDelegate.java
index 84505d6d2a..149dc8c6e6 100644
--- a/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinConsumerDelegate.java
+++ b/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinConsumerDelegate.java
@@ -50,7 +50,7 @@ class ZipkinConsumerDelegate implements ZipkinTracingDelegate {
   }
 
   @Override
-  public synchronized Span createSpan(Invocation invocation) {
+  public Span createSpan(Invocation invocation) {
     return handler.handleSend(requestWrapper.invocation(invocation));
   }
 
diff --git a/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinProviderDelegate.java b/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinProviderDelegate.java
index 48156c57d2..0820f0c8c3 100644
--- a/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinProviderDelegate.java
+++ b/handlers/handler-tracing-zipkin/src/main/java/org/apache/servicecomb/tracing/zipkin/ZipkinProviderDelegate.java
@@ -80,7 +80,7 @@ public Tracing tracer() {
   }
 
   @Override
-  public synchronized Span createSpan(Invocation invocation) {
+  public Span createSpan(Invocation invocation) {
     return handler.handleReceive(requestWrapper.invocation(invocation));
   }