diff --git a/core/api/src/main/java/com/alipay/sofa/rpc/config/UserThreadPoolManager.java b/core/api/src/main/java/com/alipay/sofa/rpc/config/UserThreadPoolManager.java
index 6f044f986..0f667ca0f 100644
--- a/core/api/src/main/java/com/alipay/sofa/rpc/config/UserThreadPoolManager.java
+++ b/core/api/src/main/java/com/alipay/sofa/rpc/config/UserThreadPoolManager.java
@@ -81,9 +81,7 @@ public static UserThreadPool getUserThread(String service) {
     public static Set<UserThreadPool> getUserThreadPoolSet() {
         Set<UserThreadPool> userThreadPoolSet = new HashSet<>();
         if (hasUserThread()) {
-            for (UserThreadPool userThreadPool : userThreadMap.values()) {
-                userThreadPoolSet.add(userThreadPool);
-            }
+            userThreadPoolSet.addAll(userThreadMap.values());
         }
         return userThreadPoolSet;
     }