diff --git a/designer-base/src/main/java/com/fr/design/carton/EventDispatchThreadHangMonitor.java b/designer-base/src/main/java/com/fr/design/carton/EventDispatchThreadHangMonitor.java
index 8c8c160578..83c3f670e6 100644
--- a/designer-base/src/main/java/com/fr/design/carton/EventDispatchThreadHangMonitor.java
+++ b/designer-base/src/main/java/com/fr/design/carton/EventDispatchThreadHangMonitor.java
@@ -25,7 +25,6 @@ import java.lang.management.ThreadMXBean;
 import java.util.LinkedList;
 import java.util.Timer;
 import java.util.TimerTask;
-import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;