diff --git a/code/application/source/sf_app/code/source/app/sf_service.c b/code/application/source/sf_app/code/source/app/sf_service.c
index 142000d82..8ae40920f 100755
--- a/code/application/source/sf_app/code/source/app/sf_service.c
+++ b/code/application/source/sf_app/code/source/app/sf_service.c
@@ -177,8 +177,14 @@ SINT32 sf_USB_net_init(void) {
             for (i = 0; i < 20; i++) {
                 if(strncmp(puiPara->ModuleVer, GPRS_MODULE_TYPE_EG915Q, 6) == 0){
                     ret = sf_check_usb0();
+                    if(ret != SUCCESS){
+                        ret = sf_check_eth0();
+                    }
                 }else{
                     ret = sf_check_eth0();
+                    if(ret != SUCCESS){
+                        ret = sf_check_usb0();
+                    }
                 }
                 if (SUCCESS == ret) {
                     ret = SF_SUCCESS;