diff --git a/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c b/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c
index 93636a079..30564096b 100755
--- a/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c
+++ b/code/application/source/sf_app/code/source/wifi/sf_wifi_svr.c
@@ -1314,8 +1314,11 @@ SINT32 sf_svr_packet_proc(SINT32 fd, UINT8  *pAppData, UINT16 dataLen)
                         strcpy((char *)fileName, (char *)pMsgStruct->msgBuf.getThumbList.fileName);
                         if((pMsgStruct->msgBuf.getThumbList.diskType) && (Disk != pMsgStruct->msgBuf.getThumbList.diskType))
                         {
+                            if(Disk)
+                            {
+                                memset(fileName,'\0', sizeof(fileName));
+                            }
                             Disk = pMsgStruct->msgBuf.getThumbList.diskType;
-                            memset(fileName,'\0', sizeof(fileName));
                         }
                         MLOGI("[WIFI_GET_CAMERA_THUMB_LIST],fileName:%s diskType:%d\n",fileName,pMsgStruct->msgBuf.getThumbList.diskType);
                         appCreatThumbList(fileName,pMsgStruct->msgBuf.getThumbList.diskType);