diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/executor/XxlJobExecutor.java b/xxl-job-core/src/main/java/com/xxl/job/core/executor/XxlJobExecutor.java
index 98c366b4..5a38f414 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/executor/XxlJobExecutor.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/executor/XxlJobExecutor.java
@@ -147,7 +147,7 @@ public class XxlJobExecutor  {
 
         xxlRpcProviderFactory.setServer(NettyHttpServer.class);
         xxlRpcProviderFactory.setSerializer(HessianSerializer.class);
-        xxlRpcProviderFactory.setCorePoolSize(30);
+        xxlRpcProviderFactory.setCorePoolSize(20);
         xxlRpcProviderFactory.setMaxPoolSize(200);
         xxlRpcProviderFactory.setIp(ip);
         xxlRpcProviderFactory.setPort(port);