diff --git a/RecycleBin/App.xaml.cs b/RecycleBin/App.xaml.cs
index d374a5f..ae3c3aa 100644
--- a/RecycleBin/App.xaml.cs
+++ b/RecycleBin/App.xaml.cs
@@ -1,4 +1,6 @@
-using System.Windows;
+using System.Diagnostics;
+using System.Threading;
+using System.Windows;
 
 namespace RecycleBin
 {
@@ -7,13 +9,28 @@ namespace RecycleBin
     /// </summary>
     public partial class App
     {
+        private static Mutex _mutex;
         private readonly Tray _tray = new Tray();
 
         private void ApplicationStartup(object sender, StartupEventArgs e)
         {
+            CheckRunning();
+            
             _tray.CreateTrayIcon();
         }
 
+        /// <summary>
+        /// 检测是否已经有相同程序在运行。如果存在，则退出当前程序
+        /// </summary>
+        private static void CheckRunning()
+        {
+            bool noRun;
+            _mutex = new Mutex(true, "RecycleBin", out noRun);
+
+            if (noRun) _mutex.ReleaseMutex();
+            else Process.GetCurrentProcess().Kill();
+        }
+
         // 程序退出
         private void ApplicationExit(object sender, ExitEventArgs e)
         {