diff --git a/board/Nuvoton_M251/BSP/Src/main.c b/board/Nuvoton_M251/BSP/Src/main.c
index 8db7e611..d3129412 100644
--- a/board/Nuvoton_M251/BSP/Src/main.c
+++ b/board/Nuvoton_M251/BSP/Src/main.c
@@ -1,9 +1,9 @@
 #include "stdio.h"
 #include "NuMicro.h"
 #include "tos_k.h"
-#define task1_size   240  // size of task1 stack
-#define task2_size 	 240
-k_task_t task1;   				//structure of task1
+#define task1_size    240  // size of task1 stack
+#define task2_size    240
+k_task_t task1;            // structure of task1
 k_task_t task2;
 
 k_stack_t task1_stack[task1_size];   //stack of task1
@@ -14,23 +14,23 @@ void SYS_Init(void)
     /*---------------------------------------------------------------------------------------------------------*/
     /* Init System Clock                                                                                       */
     /*---------------------------------------------------------------------------------------------------------*/
-		/* Unlock protected registers */
+    /* Unlock protected registers */
     SYS_UnlockReg();
 
-		/* Set XT1_OUT(PF.2) and XT1_IN(PF.3) to input mode to prevent leakage  */
+    /* Set XT1_OUT(PF.2) and XT1_IN(PF.3) to input mode to prevent leakage  */
     PF->MODE &= ~(GPIO_MODE_MODE2_Msk | GPIO_MODE_MODE3_Msk);
 
     /* Disable digital input path of analog pin XT1_OUT to prevent leakage */
     GPIO_DISABLE_DIGITAL_PATH(PF, BIT2 | BIT3);
 
-	  /* Enable£¬ HXT  clock */
+    /* Enable£¬ HXT  clock */
     CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
 
     /* Switch HCLK clock source to external  */
     CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HXT, CLK_CLKDIV0_HCLK(1));  //here switch zhe MCU clock to external
 
-	  /*Set the core clock freq*/
-		CLK_SetCoreClock(FREQ_32MHZ);   //set the core clock freq,should not higher than your HCLK clock freq
+    /*Set the core clock freq*/
+    CLK_SetCoreClock(FREQ_32MHZ);   //set the core clock freq,should not higher than your HCLK clock freq
 
     /* Enable UART module clock */
     CLK_EnableModuleClock(UART0_MODULE);
@@ -59,37 +59,35 @@ void UART0_Init()
 //task1 function
 void task1_fun(void *Parameter)
 {
-
-	while(1)
-	{
-			printf("Task1 £ºThansplant CORTEX-M23 Succeed\r\n");
-			PB14 =~ PB14;
-			tos_task_delay(1000);
-	}
-
+    while(1)
+    {
+        printf("Task1: Thansplant CORTEX-M23 Succeed\r\n");
+        PB14 =~ PB14;
+        tos_task_delay(1000);
+    }
 }
 
 void task2_task(void *Parameter)
 {
-
-		k_err_t err;
-		while(1)
-		{
-			printf("Task2: hello world, hello Nuvoton \r\n");
-			tos_task_delay(100);
-		}
+    k_err_t err;
+    while(1)
+    {
+        printf("Task2: hello world, hello Nuvoton \r\n");
+        tos_task_delay(100);
+    }
 }
 
 int main()
 {
-		k_err_t err;
-	 /* Unlock protected registers */
+    k_err_t err;
+    /* Unlock protected registers */
     SYS_UnlockReg();
 
     /* Init System, peripheral clock and multi-function I/O */
     SYS_Init();
 
-		tos_knl_init();   //tos init ,include SystickInit,should init after protected registers unlock
+    /* tos init ,include SystickInit,should init after protected registers unlock */
+    tos_knl_init();   
 
     /* Lock protected registers */
     SYS_LockReg();
@@ -97,35 +95,32 @@ int main()
     /* Init UART0 for printf */
     UART0_Init();
 
-		printf("system clock to %d Hz, PLL clock to %d Hz...................... ", SystemCoreClock, CLK_SetCoreClock(FREQ_32MHZ));
+    printf("system clock to %d Hz, PLL clock to %d Hz...................... ", SystemCoreClock, CLK_SetCoreClock(FREQ_32MHZ));
 
-		GPIO_SetMode(PB, BIT14, GPIO_MODE_OUTPUT);
+    GPIO_SetMode(PB, BIT14, GPIO_MODE_OUTPUT);
 
-		err = tos_task_create(
-				&task1,
-				"Task1",
-				task1_fun,
-				NULL,
-				2,
-				task1_stack,
-				task1_size,
-				100
-			);
-
-		err = tos_task_create(
-				&task2,
-				"display",
-				task2_task,
-				NULL,
-				2,
-				task2_stack,
-				task2_size,
-				100);
-
-		if(err != K_ERR_NONE)
-		printf("TenentOS creat task fail! code is %d\r\n",err);
-
-		tos_knl_start(); //Start TOS TINY
+    err = tos_task_create(
+                    &task1,
+                    "Task1",
+                    task1_fun,
+                    NULL,
+                    2,
+                    task1_stack,
+                    task1_size,
+                    100);
+    
+    err = tos_task_create(
+                    &task2,
+                    "display",
+                    task2_task,
+                    NULL,
+                    2,
+                    task2_stack,
+                    task2_size,
+                    100);
 
+    if(err != K_ERR_NONE)
+        printf("TencentOS create task fail! errcode is %d\r\n",err);
 
+    tos_knl_start(); //Start TOS TINY
 }