diff --git a/application/admin/view/system/system_databackup/index.php b/application/admin/view/system/system_databackup/index.php
index f95d8e0c..faf58bb6 100644
--- a/application/admin/view/system/system_databackup/index.php
+++ b/application/admin/view/system/system_databackup/index.php
@@ -49,8 +49,8 @@
     function ipmosrting(time,part = null,start = null) {
         var data = {
             time:time,
-            part:part||'',
-            start:start||''
+            part:part,
+            start:start
         };
         layList.basePost(layList.Url({a:'import'}),data,function (res) {
             console.log(res);