diff --git a/server/src/main/java/com/alibaba/otter/canal/server/CanalMQStarter.java b/server/src/main/java/com/alibaba/otter/canal/server/CanalMQStarter.java
index d10fad77..ad4fc266 100644
--- a/server/src/main/java/com/alibaba/otter/canal/server/CanalMQStarter.java
+++ b/server/src/main/java/com/alibaba/otter/canal/server/CanalMQStarter.java
@@ -59,7 +59,7 @@ public class CanalMQStarter {
             canalServer = CanalServerWithEmbedded.instance();
 
             // 对应每个instance启动一个worker线程
-            executorService = Executors.newFixedThreadPool(canalServer.getCanalInstances().size());
+            executorService = Executors.newCachedThreadPool();
             logger.info("## start the MQ workers.");
             for (final CanalInstance canalInstance : canalServer.getCanalInstances().values()) {
                 CanalMQRunnable canalMQRunnable = new CanalMQRunnable(canalInstance);