diff --git a/IdleUtil/IdleUtil.cs b/IdleUtil/IdleUtil.cs
new file mode 100644
index 0000000..0e1e573
--- /dev/null
+++ b/IdleUtil/IdleUtil.cs
@@ -0,0 +1,167 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+namespace Utils
+{
+    /// <summary>
+    /// 空闲监控工具
+    /// 提供定时器操作方法，当用户超过指定时间未操作时，触发Timeout事件
+    /// </summary>
+    public class IdleUtil
+    {
+        #region Public
+
+        /// <summary>
+        /// 重置定时器为新时间
+        /// </summary>
+        /// <param name="dueTime">超过多少时间未操作发出事件（毫秒）</param>
+        public void Reset(int dueTime)
+        {
+            Start(dueTime);
+        }
+
+        /// <summary>
+        /// 重置定时器
+        /// </summary>
+        public void Reset()
+        {
+            Start(this.DueTime);
+        }
+
+        /// <summary>
+        /// 开始计时
+        /// </summary>
+        /// <param name="dueTime">超过多少时间未操作发出事件（毫秒）</param>
+        public void Start(int dueTime)
+        {
+            DueTime = dueTime;
+            if (!IsRunning)
+            {
+                IsRunning = true;
+                MonitorThread = new Thread(Moniter) { IsBackground = true };
+                MonitorThread.Start();
+            }
+            Timer.Change(dueTime, Timeout.Infinite);
+        }
+
+        /// <summary>
+        /// 停止计时
+        /// </summary>
+        public void Stop()
+        {
+            IsRunning = false;
+            Timer.Change(Timeout.Infinite, Timeout.Infinite);
+        }
+
+        #endregion Public
+
+        #region Event
+
+        /// <summary>
+        /// 超过指定事件未操作事件
+        /// </summary>
+        public event EventHandler TimeoutEvent;
+
+        #endregion Event
+
+        #region Ctor
+
+        public IdleUtil()
+        {
+            Timer = new Timer(OnTimeout);
+        }
+
+        #endregion Ctor
+
+        #region Private
+
+        /// <summary>
+        /// 定时器
+        /// </summary>
+        private readonly Timer  Timer;
+
+        /// <summary>
+        /// 用户要求定时时间
+        /// </summary>
+        private          int    DueTime;
+
+        /// <summary>
+        /// 线程是否运行
+        /// </summary>
+        private          bool   IsRunning;
+
+        /// <summary>
+        /// 监控线程
+        /// </summary>
+        private          Thread MonitorThread;
+        /// <summary>
+        /// 监控线程方法
+        /// </summary>
+        private void Moniter()
+        {
+            while (IsRunning)
+            {
+                if (GetLastInputTime() == 0)
+                    Reset();
+                Thread.Sleep(1000);
+            }
+        }
+
+        #endregion Private
+
+        #region Trigger
+
+        private void OnTimeout(object _)
+        {
+            if (TimeoutEvent != null)
+                TimeoutEvent(this, EventArgs.Empty);
+            // 只触发一次
+            Timer.Change(Timeout.Infinite, Timeout.Infinite);
+        }
+
+        #endregion Trigger
+
+        #region WindowsAPI
+
+        [DllImport("user32.dll")]
+        private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);
+
+        /// <summary>
+        /// 获取用户最后一次输入的时间
+        /// </summary>
+        /// <returns>最后一次输入的时间</returns>
+        private static uint GetLastInputTime()
+        {
+            uint idleTime = 0;
+            LASTINPUTINFO lastInputInfo = new LASTINPUTINFO();
+            lastInputInfo.cbSize = (uint)Marshal.SizeOf(lastInputInfo);
+            lastInputInfo.dwTime = 0;
+
+            uint envTicks = (uint)Environment.TickCount;
+
+            if (GetLastInputInfo(ref lastInputInfo))
+            {
+                uint lastInputTick = lastInputInfo.dwTime;
+
+                idleTime = envTicks - lastInputTick;
+            }
+
+            return ((idleTime > 0) ? (idleTime / 1000) : 0);
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct LASTINPUTINFO
+        {
+            public static readonly int SizeOf = Marshal.SizeOf(typeof(LASTINPUTINFO));
+
+            [MarshalAs(UnmanagedType.U4)]
+            public UInt32 cbSize;
+
+            [MarshalAs(UnmanagedType.U4)]
+            public UInt32 dwTime;
+        }
+
+        #endregion WindowsAPI
+    }
+}
\ No newline at end of file