diff --git a/bsp/lm3s8962/applications/startup.c b/bsp/lm3s8962/applications/startup.c
index 7f34aeef9589cfaf055a5f3002caf3443994b400..1f206a51b7da8de1aa2c8e08a3b0870285aee718 100644
--- a/bsp/lm3s8962/applications/startup.c
+++ b/bsp/lm3s8962/applications/startup.c
@@ -142,10 +142,8 @@ void rtthread_startup(void)
 
 int main(void)
 {
-	rt_uint32_t level UNUSED;
-
 	/* disable interrupt first */
-	level = rt_hw_interrupt_disable();
+	rt_hw_interrupt_disable();
 	rtthread_startup();
 	
 	return 0;
diff --git a/bsp/lpc2148/drivers/serial.c b/bsp/lpc2148/drivers/serial.c
index 6cfcbb18a8c75208972f64d36ab98503c60ff252..e8dcda2d0f405c19cebab2ae1ecff4c9e911f7a6 100644
--- a/bsp/lpc2148/drivers/serial.c
+++ b/bsp/lpc2148/drivers/serial.c
@@ -66,7 +66,7 @@ void rt_hw_serial_init(void);
 
 void rt_hw_uart_isr(struct rt_lpcserial* lpc_serial)
 {
-	UNUSED rt_uint32_t iir;
+	RT_UNUSED rt_uint32_t iir;
 
 	RT_ASSERT(lpc_serial != RT_NULL)
 
diff --git a/bsp/lpc2478/drivers/serial.c b/bsp/lpc2478/drivers/serial.c
index 8a0e1aa15b332b6e7066ffd4f402468ed57daa11..9bb95f2e0da325385500ef23151a5b8faa04bb3c 100644
--- a/bsp/lpc2478/drivers/serial.c
+++ b/bsp/lpc2478/drivers/serial.c
@@ -66,7 +66,7 @@ void rt_hw_serial_init(void);
 
 void rt_hw_uart_isr(int irqno, void *param)
 {
-	UNUSED rt_uint32_t iir;
+	RT_UNUSED rt_uint32_t iir;
 	struct rt_lpcserial* lpc_serial = (struct rt_lpcserial*)param;
 
 	RT_ASSERT(lpc_serial != RT_NULL)
diff --git a/bsp/mb9bf500r/startup.c b/bsp/mb9bf500r/startup.c
index 2549441b99e76b772c51387399a193d25cc4a08a..dc65496ba61f324b89b65383cec620d617583a73 100644
--- a/bsp/mb9bf500r/startup.c
+++ b/bsp/mb9bf500r/startup.c
@@ -90,10 +90,8 @@ void rtthread_startup(void)
 
 int main(void)
 {
-	rt_uint32_t UNUSED level;
-
 	/* disable interrupt first */
-	level = rt_hw_interrupt_disable();
+	rt_hw_interrupt_disable();
 
 	/* init system setting */
 	SystemInit();
diff --git a/bsp/mini4020/drivers/board.c b/bsp/mini4020/drivers/board.c
index 72b75d4846b697ab4f00a08890784b6134725155..b77d8faf59e2423cbd363483d3f3b8f77a6d88cf 100644
--- a/bsp/mini4020/drivers/board.c
+++ b/bsp/mini4020/drivers/board.c
@@ -51,7 +51,7 @@ void rt_serial_handler(int vector, void *param)
 {
 	//rt_kprintf("in rt_serial_handler\n");
 	rt_int32_t stat = *(RP)UART0_IIR ;
-	UNUSED char c;
+	RT_UNUSED char c;
 
 	/*Received data*/
 	if (((stat & 0x0E) >> 1) == 0x02)
diff --git a/bsp/mini4020/drivers/sdcard.c b/bsp/mini4020/drivers/sdcard.c
index 9b802d2ecf9d8acb99ee4daa6acf66288ccc3aae..af3e3fd419e18b6430fdaefdd229fdcbfd4bae8b 100644
--- a/bsp/mini4020/drivers/sdcard.c
+++ b/bsp/mini4020/drivers/sdcard.c
@@ -271,7 +271,7 @@ static rt_err_t sd_readblock(rt_uint32_t address, rt_uint8_t* buf)
 	U32 complete,i;
 	rt_uint8_t temp;
 	rt_err_t err;
-	UNUSED rt_uint32_t discard;
+	RT_UNUSED rt_uint32_t discard;
 	#ifdef USE_TIMEOUT
 	rt_uint32_t to = 10;
 	#endif
diff --git a/bsp/nios_ii/startup.c b/bsp/nios_ii/startup.c
index cb43a7ae0bd7538c978dfb7b407b83d62997c960..25ebb5e4ac5aa9b8ceb2a64f76bea0a0260fdf9f 100644
--- a/bsp/nios_ii/startup.c
+++ b/bsp/nios_ii/startup.c
@@ -85,10 +85,8 @@ void rtthread_startup(void)
 
 int main(void)
 {
-    rt_uint32_t UNUSED level;
-
     /* disable interrupt first */
-    level = rt_hw_interrupt_disable();
+    rt_hw_interrupt_disable();
 
     /* startup RT-Thread RTOS */
     rtthread_startup();