diff --git a/code/application/source/sf_app/code/source/systemMng/sf_commu_mcu_reg.c b/code/application/source/sf_app/code/source/systemMng/sf_commu_mcu_reg.c
index 72d48d6d5..2ff38892f 100755
--- a/code/application/source/sf_app/code/source/systemMng/sf_commu_mcu_reg.c
+++ b/code/application/source/sf_app/code/source/systemMng/sf_commu_mcu_reg.c
@@ -262,8 +262,8 @@ unsigned char sf_mcu_wdg_set(unsigned char value)
 {
 	unsigned char i = 0;
 	unsigned char regsize =0;
-	unsigned char mcuReg[2] = {0};
-	unsigned char mcuPara[2] = {0};
+	unsigned char mcuReg[3] = {0};
+	unsigned char mcuPara[3] = {0};
 	UIMenuStoreInfo *puiPara = sf_app_ui_para_get();
     
     if(puiPara->DebugMode)