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 2ac9744e5..19d5fab7f 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
@@ -87,21 +87,27 @@ SF_THREAD_S QlogTsk = {
 SINT32 app_ttyusb_IsOpen(void) {
     int retryTime = 0;
     int retryFlag = 0;
-    SINT32 s32ret = 0;
+    static SINT32 s32ret = SF_SUCCESS;
+    static int flag = 0;
+
+    if(flag)
+    {
+        return s32ret;
+    }
     MLOGD("ttyUSB has not been init, will init ttyUSB!\n");
 
     UINT8 i = 0;
     RETRY:
     for (i = 0; i < 150; i++) {
         if (access("/dev/ttyUSB2", F_OK) == SF_SUCCESS) {
-            printf("tty usb ko exist!\r\n");
+            // printf("tty usb ko exist!\r\n");
             printf("4G Init OK\r\n");
             break;
         } else {
             usleep(100 * 1000);
             if(149 == i)
             {
-                MLOGE("NO ttyUSB dev!!\n");
+                // MLOGE("NO ttyUSB dev!!\n");
                 printf("4G Init ERR\r\n");
             }
         }
@@ -121,12 +127,13 @@ SINT32 app_ttyusb_IsOpen(void) {
         } else if ((1 == retryFlag) && (retryTime >= 50) &&
                     (retryTime % 50 == 0)) // 200ms*25 = 5s
         {
-            MLOGE("-------ttyUSB retry init fail!\n");
+            // MLOGE("-------ttyUSB retry init fail!\n");
             s32ret = SF_TTY_ERROR_OPEN;
             printf("4G Init Fail, retry\r\n");
             break;
         }
     }
+    flag = 1;
     MLOGD("e\n");
     return s32ret;
 }
@@ -1140,7 +1147,7 @@ static SINT32 app_file_transfer(SF_FN_PARAM_S *pfnParam) {
   if (sf_usb_IsInsert())
     return SF_SUCCESS;
 
-  SLOGD("STARTUP:[%d]\n", sf_poweron_type_get());
+//   SLOGD("STARTUP:[%d]\n", sf_poweron_type_get());
   if (sf_get_cq_signal() == 0) {
     SLOGD("no csq signal\n");
     return SF_SUCCESS;
@@ -2173,7 +2180,7 @@ int sf_check_eth0(void)
 
     // Check if an IP address is assigned
     if (strstr(output, "inet ") == NULL) {
-        MLOGI("The network card exists, but no IP address has been assigned\n");
+        // MLOGI("The network card exists, but no IP address has been assigned\n");
         pclose(fp);
         free(output);
         return 1;