diff --git a/Sys.cpp b/Sys.cpp
index 0ad53ea1..3336a3f9 100644
--- a/Sys.cpp
+++ b/Sys.cpp
@@ -574,6 +574,17 @@ bool TSys::SetTask(uint taskid, bool enable, int usNextTime)
 	return true;
 }
 
+// 改变任务周期
+bool TSys::SetTaskPeriod(uint taskid, Int64 period)
+{
+	Task* task = Task::Get(taskid);
+	if(!task) return false;
+
+	task->Period = period;
+
+	return true;
+}
+
 void TSys::Start()
 {
 #if DEBUG
diff --git a/Sys.h b/Sys.h
index 1ff7f772..37acb2c8 100644
--- a/Sys.h
+++ b/Sys.h
@@ -130,6 +130,8 @@ public:
 	void RemoveTask(uint taskid);
 	// 设置任务的开关状态，同时运行指定任务最近一次调度的时间，0表示马上调度
 	bool SetTask(uint taskid, bool enable, int usNextTime = -1);
+	// 改变任务周期
+	bool SetTaskPeriod(uint taskid, Int64 period);
 	void Start();	// 开始系统大循环
 	Func OnStart;
 };
diff --git a/TinyNet/TinyClient.cpp b/TinyNet/TinyClient.cpp
index 40a3e259..c9a8983e 100644
--- a/TinyNet/TinyClient.cpp
+++ b/TinyNet/TinyClient.cpp
@@ -279,10 +279,9 @@ bool TinyClient::OnJoin(TinyMessage& msg)
 	Password.Show(true);
 
 	// 取消Join任务，启动Ping任务
-	Task* task = Task::Get(_TaskID);
 	ushort time = Config.PingTime;
 	if(time < 5) time = 5;
-	task->Period = time * 1000000;
+	Sys.SetTaskPeriod(_TaskID, time * 1000000);
 
 	// 组网成功更新一次最后活跃时间
 	LastActive = Time.Current();
@@ -307,8 +306,7 @@ void TinyClient::Ping()
 
 		debug_printf("%d 秒无法联系，服务端可能已经掉线，重启Join任务，关闭Ping任务\r\n", off);
 
-		Task* task = Task::Get(_TaskID);
-		task->Period = 5000000;
+		Sys.SetTaskPeriod(_TaskID, 5000000);
 
 		Server		= 0;
 		Password	= 0;