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 61b6a6d0c..c9abf4497 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
@@ -2586,7 +2586,7 @@ int sf_check_sd(void)
     }
     if (sf_activity_status_get() != SF_SD_OK) {
         ret = SF_FAILURE;
-        for (i = 0; i < 20; i++)
+        for (i = 0; i < 100; i++)
         {
             if (SF_SD_OK == sf_activity_status_get())
             {
@@ -2599,7 +2599,7 @@ int sf_check_sd(void)
             {
                 if (1 == sf_is_sdc_mounted())
                 {
-                    if(cnt > 3)
+                    if(cnt > 80)
                     {
                         ret = SF_SUCCESS;
                         MLOGI("mounted SD\r\n");
@@ -2608,8 +2608,7 @@ int sf_check_sd(void)
                     }
                     cnt++;
                 } 
-                sleep(1);
-                
+                sf_sleep_ms(200);
             }
         }
         flag = 1;