diff --git a/rtos/code/driver/na51089/source/mcu/sf_mcu.c b/rtos/code/driver/na51089/source/mcu/sf_mcu.c
index 572d9177e..9a392d83e 100755
--- a/rtos/code/driver/na51089/source/mcu/sf_mcu.c
+++ b/rtos/code/driver/na51089/source/mcu/sf_mcu.c
@@ -1769,6 +1769,10 @@ UINT8 sf_mcu_reg_set(MCUParam_t attrId, UINT8 val)
         mcuReg[i] = DAILY_SEND4_MINUTE;
         mcuData[i++] = puiPara->TimeSend4.Min;
     }else if(attrId == SF_MCU_CTRL_MODULE_PIR){
+
+        mcuReg[i] = WDT_TIME;
+        mcuData[i++] = 5;//sf_mcu_wdg_set(5);
+        
         mcuReg[i] = ANALOG_PIR_SENSITIVITY;
 
         temp = (puiPara->PirSensitivity);//sf_mcu_analog_pir_sen_convert(SysGetFlag(DigPirSensitivity));