diff --git a/client/src/main/java/org/apache/rocketmq/client/ClientConfig.java b/client/src/main/java/org/apache/rocketmq/client/ClientConfig.java
index d0ae5e1b8315370c3ce3373c330e9a7d0df2ca84..bcd3f9b205263375701ad815f7d1baa7898a5330 100644
--- a/client/src/main/java/org/apache/rocketmq/client/ClientConfig.java
+++ b/client/src/main/java/org/apache/rocketmq/client/ClientConfig.java
@@ -94,7 +94,7 @@ public class ClientConfig {
 
     public void changeInstanceNameToPID() {
         if (this.instanceName.equals("DEFAULT")) {
-            this.instanceName = String.valueOf(UtilAll.getPid());
+            this.instanceName = UtilAll.getPid()+ "#" + System.nanoTime();
         }
     }