diff --git a/bsp/stm32f10x/application.c b/bsp/stm32f10x/application.c
index 5da04d88308085e65269bc41e433115670cb6255..2518cb26f932b0f42ac239a1b2aa8995320e2dce 100644
--- a/bsp/stm32f10x/application.c
+++ b/bsp/stm32f10x/application.c
@@ -45,8 +45,6 @@
 
 #include "led.h"
 
-extern rt_sem_t touch_screen_calibrated;
-
 ALIGN(RT_ALIGN_SIZE)
 static rt_uint8_t led_stack[ 512 ];
 static struct rt_thread led_thread;
@@ -153,17 +151,6 @@ void rt_init_thread_entry(void* parameter)
 		/* set lcd device as rtgui graphic driver */
 		rtgui_graphic_set_device(lcd);
 
-		/* without calibration, the position we got from the touch screen is
-		 * useless raw value and the GUI is unusable. */
-		calibration_init();
-		if (touch_screen_calibrated != RT_NULL)
-		{
-			rt_sem_take(touch_screen_calibrated, RT_WAITING_FOREVER);
-			/* NOTE: no other thread use this semaphore, so we can delete it.
-			 * If this is not your case, comment this line. */
-			rt_sem_delete(touch_screen_calibrated);
-		}
-
 		/* startup rtgui */
 		rtgui_startup();
 	}
diff --git a/bsp/stm32f10x/calibration.c b/bsp/stm32f10x/calibration.c
index 544866f3f03f703b897154a6b804b2d440dd1646..92bd10fe446d6e433d4b112f5ee24bf298720ffb 100644
--- a/bsp/stm32f10x/calibration.c
+++ b/bsp/stm32f10x/calibration.c
@@ -30,9 +30,6 @@ struct calibration_session
 };
 static struct calibration_session* calibration_ptr = RT_NULL;
 
-/* a semaphore that will become avaible when calibration finished. */
-rt_sem_t touch_screen_calibrated = RT_NULL;
-
 static void calibration_data_post(rt_uint16_t x, rt_uint16_t y)
 {
 	if (calibration_ptr != RT_NULL)
@@ -257,8 +254,6 @@ void calibration_entry(void* parameter)
 	/* release memory */
 	rt_free(calibration_ptr);
 	calibration_ptr = RT_NULL;
-	/* tell other thread that we finished calibration */
-	rt_sem_release(touch_screen_calibrated);
 }
 
 void calibration_init()
@@ -266,12 +261,7 @@ void calibration_init()
 	rt_device_t device;
 
 	device = rt_device_find("touch");
-	if (device == RT_NULL)
-		return; /* no such device */
-
-	touch_screen_calibrated = rt_sem_create("tc_cali", 0, RT_IPC_FLAG_FIFO);
-	if (touch_screen_calibrated == RT_NULL)
-		return;
+	if (device == RT_NULL) return; /* no this device */
 
 	calibration_ptr = (struct calibration_session*)rt_malloc(sizeof(struct calibration_session));
 	rt_memset(calibration_ptr, 0, sizeof(struct calibration_data));
@@ -281,8 +271,7 @@ void calibration_init()
 
 	calibration_ptr->tid = rt_thread_create("cali", calibration_entry, RT_NULL,
 		2048, 20, 5);
-	if (calibration_ptr->tid != RT_NULL)
-		rt_thread_startup(calibration_ptr->tid);
+	if (calibration_ptr->tid != RT_NULL) rt_thread_startup(calibration_ptr->tid);
 }
 
 #ifdef RT_USING_FINSH