diff --git a/builtinftp/src/main/java/com/stupidbeauty/ftpserver/lib/ControlConnectHandler.java b/builtinftp/src/main/java/com/stupidbeauty/ftpserver/lib/ControlConnectHandler.java
index 7612df3..482ad5c 100644
--- a/builtinftp/src/main/java/com/stupidbeauty/ftpserver/lib/ControlConnectHandler.java
+++ b/builtinftp/src/main/java/com/stupidbeauty/ftpserver/lib/ControlConnectHandler.java
@@ -29,6 +29,12 @@
 import java.util.Random;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
+import android.net.Uri;
+import android.provider.Settings;
+import android.content.Intent;
+import android.os.Environment;
+
+
 
 class ControlConnectHandler
 {
@@ -518,6 +524,39 @@ public void run()
         uiHandler.post(runnable);
       } //if (eventListener!=null) // 有事件监听器。
     } //private void notifyEvent(String eventCode)
+
+    /**
+    *  CheCK THE permission of file manager.
+    */
+    private void checkFileManagerPermission()
+    {
+      boolean isFileManager=Environment.isExternalStorageManager();
+
+      if (isFileManager) // Is file manager
+      {
+      } // if (isFileManager) // Is file manager
+      else // Not file manager
+      {
+//         Chen xin
+        gotoFileManagerSettingsPage(); // Goto file manager settings page.
+      } // else // Not file manager
+    } // private void checkFileManagerPermission()
+
+    /**
+    *   Goto file manager settings page.
+    */
+    private void gotoFileManagerSettingsPage()
+    {
+      Intent intent = new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION);  // 跳转语言和输入设备
+
+      String packageNmae=context.getPackageName();
+
+      String url = "package:"+packageNmae;
+
+      intent.setData(Uri.parse(url));
+
+      context.startActivity(intent);
+    } // private void gotoFileManagerSettingsPage()
     
     /**
     * 处理目录列表命令。
@@ -532,6 +571,8 @@ private void processListCommand(String content)
       binaryStringSender.sendStringInBinaryMode(replyString); // 发送回复。
 
       sendListContentBySender(content, currentWorkingDirectory); // 发送目录列表数据。
+
+      checkFileManagerPermission(); // CheCK THE permission of file manager.
     } //private void processListCommand(String content)
 
     /**