diff --git a/software/Power_Pico/Core/Src/freertos.c b/software/Power_Pico/Core/Src/freertos.c
index 6ff6f88..e03ee70 100644
--- a/software/Power_Pico/Core/Src/freertos.c
+++ b/software/Power_Pico/Core/Src/freertos.c
@@ -51,8 +51,8 @@
 osThreadId_t defaultTaskHandle;
 const osThreadAttr_t defaultTask_attributes = {
   .name = "defaultTask",
-  .stack_size = 128 * 4,
-  .priority = (osPriority_t) osPriorityNormal,
+  .stack_size = 128 * 1,
+  .priority = (osPriority_t) osPriorityLow,
 };
 
 /* Private function prototypes -----------------------------------------------*/
@@ -129,8 +129,6 @@ void MX_FREERTOS_Init(void) {
 /* USER CODE END Header_StartDefaultTask */
 void StartDefaultTask(void *argument)
 {
-  /* init code for USB_DEVICE */
-  MX_USB_DEVICE_Init();
   /* USER CODE BEGIN StartDefaultTask */
   /* Infinite loop */
   for(;;)
diff --git a/software/Power_Pico/User/Tasks/Src/user_HardwareInitTask.c b/software/Power_Pico/User/Tasks/Src/user_HardwareInitTask.c
index 1376989..72c4ca8 100644
--- a/software/Power_Pico/User/Tasks/Src/user_HardwareInitTask.c
+++ b/software/Power_Pico/User/Tasks/Src/user_HardwareInitTask.c
@@ -46,6 +46,9 @@ void HardwareInitTask(void *argument)
     Gate_Port_Init();
     flow_route_selection(HIGH_CUR);
 
+    // usb init
+    MX_USB_DEVICE_Init();
+
     // ADC sample start
     HAL_ADC_Start_DMA(&hadc1, (uint32_t *)adc_raw_buffer, ADC_TIMES*2 * ADC_CHANNELS); /*启动ADC的DMA传输，配合定时器触发ADC转换  12位的ADC对应0-4095 */
     HAL_TIM_Base_Start(&htim2); /*开启定时器，用溢出时间来触发ADC*/