diff --git a/src/com/casic/swing/ui/TimeGuardNtp.java b/src/com/casic/swing/ui/TimeGuardNtp.java
index 1b68a45..0052ae1 100644
--- a/src/com/casic/swing/ui/TimeGuardNtp.java
+++ b/src/com/casic/swing/ui/TimeGuardNtp.java
@@ -6,8 +6,6 @@
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 import javax.swing.*;
-import javax.swing.event.ChangeEvent;
-import javax.swing.event.ChangeListener;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
@@ -124,9 +122,9 @@
             }
         }.execute();
 
-        autoCheckBox.addChangeListener(new ChangeListener() {
+        autoCheckBox.addActionListener(new ActionListener() {
             @Override
-            public void stateChanged(ChangeEvent e) {
+            public void actionPerformed(ActionEvent e) {
                 JCheckBox checkBox = (JCheckBox) e.getSource();
                 if (checkBox.isSelected()) {
                     updateTimeButton.setEnabled(false);
@@ -135,7 +133,6 @@
                 } else {
                     updateTimeButton.setEnabled(true);
                     periodComboBox.setEnabled(false);
-                    stopAutoSynchronize();
                 }
             }
         });
@@ -176,12 +173,6 @@
         }, 0, period, TimeUnit.HOURS);
     }
 
-    private void stopAutoSynchronize() {
-        if (executorService != null) {
-            executorService.shutdown();
-        }
-    }
-
     private void updateView() {
         String result = CommandUtil.ntpDate(host);
         System.out.println("命令执行结果 ===> " + result);