diff --git a/Falcon.SugarApi/TimedTask/TimedTask.cs b/Falcon.SugarApi/TimedTask/TimedTask.cs
index f29b858..7aecd31 100644
--- a/Falcon.SugarApi/TimedTask/TimedTask.cs
+++ b/Falcon.SugarApi/TimedTask/TimedTask.cs
@@ -10,16 +10,12 @@ namespace Falcon.SugarApi.TimedTask
     /// <summary>
     /// 由定时器驱动的后台任务
     /// </summary>
-    public abstract class TimedTask:BackgroundService, IDisposable
+    public abstract class TimedTask:BackgroundService
     {
         /// <summary>
         /// 日志记录器
         /// </summary>
         protected readonly ILogger? Logger;
-        /// <summary>
-        /// 心跳计时器
-        /// </summary>
-        private readonly PeriodicTimer _timer;
 
         /// <summary>
         /// 运行一次任务
@@ -34,20 +30,11 @@ namespace Falcon.SugarApi.TimedTask
         /// </summary>
         protected abstract string CronSchedule { get; }
 
-        /// <summary>
-        /// Timer心跳 毫秒
-        /// </summary>
-        public virtual int Heartbeat { get; protected set; } = 1000;
-
         /// <summary>
         /// 获取下次执行任务的计划
         /// </summary>
         protected CronExpression Schedule { get; private set; }
 
-        /// <summary>
-        /// 任务正在运行
-        /// </summary>
-        private bool _isRunning = false;
         /// <summary>
         /// 下次执行时间
         /// </summary>
@@ -83,10 +70,6 @@ namespace Falcon.SugarApi.TimedTask
         /// 系统服务
         /// </summary>
         public IServiceProvider Service { get; set; }
-        /// <summary>
-        /// 资源锁
-        /// </summary>
-        private static object _lock = new object();
 
         /// <summary>
         /// 构造Timed后台任务
@@ -95,7 +78,6 @@ namespace Falcon.SugarApi.TimedTask
         public TimedTask(IServiceProvider service) {
             this.Service = service;
             this.Logger = service.GetService(typeof(ILogger<>).MakeGenericType(GetType())) as ILogger;
-            _timer = new PeriodicTimer(TimeSpan.FromMilliseconds(this.Heartbeat));
             this.Schedule = new CronExpression(this.CronSchedule);
         }
 
@@ -108,49 +90,35 @@ namespace Falcon.SugarApi.TimedTask
             if(!this.OnStart(this,stoppingToken)) {
                 return;
             }
-            while(await _timer.WaitForNextTickAsync(stoppingToken)) {
-                lock(_lock) {
+            try {
+                while(!stoppingToken.IsCancellationRequested) {
+                    DateTime nextRunTime = Schedule.GetNextOccurrence(DateTime.Now);
+                    TimeSpan delay = nextRunTime - DateTime.Now;
+                    if(delay > TimeSpan.Zero) {
+                        await Task.Delay(delay,stoppingToken);
+                    }
                     if(stoppingToken.IsCancellationRequested) {
                         break;
                     }
-                    if(this._isRunning) {
-                        continue;
+                    // 执行任务
+                    try {
+                        var goOn = await this.Run(stoppingToken);
+                        var comResult = this.OnCompleted(this,stoppingToken);
+                        if(!goOn || !comResult) {
+                            break;
+                        }
                     }
-                    if(DateTime.Now < this.NextTickTime) {
-                        continue;
+                    catch(Exception ex) {
+                        if(!this.OnException(this,ex,stoppingToken)) {
+                            break;
+                        }
                     }
-                    this._isRunning = true;
+                    //Schedule = new CronExpression(this.CronSchedule);
                 }
-                try {
-                    var goOn = await this.Run(stoppingToken);
-                    var comResult = this.OnCompleted(this,stoppingToken);
-                    if(!goOn || !comResult) {
-                        break;
-                    }
-                }
-                catch(Exception ex) {
-                    if(!this.OnException(this,ex,stoppingToken)) {
-                        break;
-                    }
-                }
-                SetNextTick();
-                this._isRunning = false;
             }
-            this.OnStop(this,stoppingToken);
-        }
-
-        private void SetNextTick(string? cronSchedule = null) {
-            var s = cronSchedule == null ? this.Schedule : new CronExpression(cronSchedule);
-            this.NextTickTime = s.GetNextOccurrence(DateTime.Now);
-        }
-
-        /// <summary>
-        /// 释放对象
-        /// </summary>
-        public override void Dispose() {
-            this._timer?.Dispose();
-            GC.SuppressFinalize(this);
-            base.Dispose();
+            finally {
+                this.OnStop(this,stoppingToken);
+            }
         }
     }
 }