diff --git a/rt-thread-version/rt-thread-standard/programming-manual/timer/timer.md b/rt-thread-version/rt-thread-standard/programming-manual/timer/timer.md
index 318b4a03fdd929dd17629dea32b7731a6907b23c..7c83cc932acc6176c735dcaade6745aef6082ff4 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/timer/timer.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/timer/timer.md
@@ -355,7 +355,7 @@ rt_err_t rt_timer_control(rt_timer_t timer, rt_uint8_t cmd, void* arg);
 /* 定时器的控制块 */
 static rt_timer_t timer1;
 static rt_timer_t timer2;
-static int cnt = 0;
+static rt_uint8_t cnt = 0;
 
 /* 定时器 1 超时函数 */
 static void timeout1(void *parameter)
@@ -365,6 +365,8 @@ static void timeout1(void *parameter)
     /* 运行第 10 次，停止周期定时器 */
     if (cnt++>= 9)
     {
+        /* 清除计数值 */
+        cnt = 0;
         rt_timer_stop(timer1);
         rt_kprintf("periodic timer was stopped! \n");
     }
@@ -376,8 +378,26 @@ static void timeout2(void *parameter)
     rt_kprintf("one shot timer is timeout\n");
 }
 
+/* 检查，清理上次的定时器 */
+static void check_timer_exist(void)
+{
+    if (timer1 != RT_NULL)
+    {
+        rt_timer_delete(timer1);
+        timer1 = RT_NULL;
+    }
+    if (timer2 != RT_NULL)
+    {
+        rt_timer_delete(timer2);
+        timer2 = RT_NULL;
+    }
+}
+
 int timer_sample(void)
 {
+    /* 检查，清理上次的定时器 */
+    check_timer_exist();
+
     /* 创建定时器 1  周期定时器 */
     timer1 = rt_timer_create("timer1", timeout1,
                              RT_NULL, 10,
@@ -443,6 +463,7 @@ static void timeout1(void* parameter)
     /* 运行 10 次 */
     if (cnt++>= 9)
     {
+        cnt = 0;
         rt_timer_stop(&timer1);
     }
 }
@@ -453,8 +474,23 @@ static void timeout2(void* parameter)
     rt_kprintf("one shot timer is timeout\n");
 }
 
+/* 检查，清理上次的定时器 */
+static void check_timer_exist(void)
+{
+   if (rt_object_find("timer1", RT_Object_Class_Timer) != RT_NULL)
+   {
+       rt_timer_detach(&timer1);
+   }
+   if (rt_object_find("timer2", RT_Object_Class_Timer) != RT_NULL)
+   {
+       rt_timer_detach(&timer2);
+   }
+}
+
 int timer_static_sample(void)
 {
+    /* 检查，清理上次的定时器 */
+    check_timer_exist();
     /* 初始化定时器 */
     rt_timer_init(&timer1, "timer1",  /* 定时器名字是 timer1 */
                     timeout1, /* 超时时回调的处理函数 */