diff --git a/examples/kernel/semaphore_static.c b/examples/kernel/semaphore_static.c
index 2ffe3ae9e87aa27dacf907b98a95e7dd7ca15695..cb199886a4998feabfb781941745d9bc9251a305 100644
--- a/examples/kernel/semaphore_static.c
+++ b/examples/kernel/semaphore_static.c
@@ -27,9 +27,13 @@ static void thread_entry(void* parameter)
     result = rt_sem_take(&sem, 10);
     if (result == -RT_ETIMEOUT)
     {
-        /* 超时后判断是否刚好是10个OS Tick */
-        if (rt_tick_get() - tick != 10)
+        rt_tick_t new_tick = rt_tick_get();
+        /* 可以有两个 tick 的误差 */
+        if (new_tick - tick >= 12)
         {
+            rt_kprintf("tick error to large: expect: 10, get %d\n",
+                       new_tick - tick);
+
             tc_done(TC_STAT_FAILED);
             rt_sem_detach(&sem);
             return;
diff --git a/examples/kernel/thread_delay.c b/examples/kernel/thread_delay.c
index 30b673ca11ca14133ee36321f4d11dcf51838de9..f9404d704c18b6bb66b60eb7509bf1fa91f55844 100644
--- a/examples/kernel/thread_delay.c
+++ b/examples/kernel/thread_delay.c
@@ -14,7 +14,7 @@ static void thread_entry(void* parameter)
     rt_kprintf("thread delay 10 tick\n");
     tick = rt_tick_get();
     rt_thread_delay(10);
-    if (rt_tick_get() - tick > 10)
+    if (rt_tick_get() - tick > 11)
     {
         tc_done(TC_STAT_FAILED);
         return;
@@ -23,7 +23,7 @@ static void thread_entry(void* parameter)
     rt_kprintf("thread delay 15 tick\n");
     tick = rt_tick_get();
     rt_thread_delay(15);
-    if (rt_tick_get() - tick > 15)
+    if (rt_tick_get() - tick > 16)
     {
         tc_done(TC_STAT_FAILED);
         return;
diff --git a/examples/kernel/thread_priority.c b/examples/kernel/thread_priority.c
index 81a9bc0382718c396079d6fab9b3f272756684f8..0045b0e578b571527dbaaa0a2ea0d50af97e464a 100644
--- a/examples/kernel/thread_priority.c
+++ b/examples/kernel/thread_priority.c
@@ -45,21 +45,21 @@ int thread_priority_init()
     rt_err_t result;
 
     result = rt_thread_init(&thread1,
-        "t1",
-        thread1_entry, RT_NULL,
-        &thread1_stack[0], sizeof(thread1_stack),
-        THREAD_PRIORITY - 1, THREAD_TIMESLICE);
-    
+                            "t1",
+                            thread1_entry, RT_NULL,
+                            &thread1_stack[0], sizeof(thread1_stack),
+                            THREAD_PRIORITY - 1, THREAD_TIMESLICE);
+
     if (result == RT_EOK)
         rt_thread_startup(&thread1);
     else
         tc_stat(TC_STAT_FAILED);
 
     rt_thread_init(&thread2,
-        "t2",
-        thread2_entry, RT_NULL,
-        &thread2_stack[0], sizeof(thread2_stack),
-        THREAD_PRIORITY + 1, THREAD_TIMESLICE);
+                   "t2",
+                   thread2_entry, RT_NULL,
+                   &thread2_stack[0], sizeof(thread2_stack),
+                   THREAD_PRIORITY + 1, THREAD_TIMESLICE);
 
     if (result == RT_EOK)
         rt_thread_startup(&thread2);