diff --git a/Application/Admin/Controller/StatisticsController.class.php b/Application/Admin/Controller/StatisticsController.class.php
index f8e2d852f..fe7c11cf0 100644
--- a/Application/Admin/Controller/StatisticsController.class.php
+++ b/Application/Admin/Controller/StatisticsController.class.php
@@ -532,7 +532,7 @@ class StatisticsController extends ThinkController {
 				if(empty($oldrand[$randdata[$i][$field]])){
 					$randdata[$i]['change'] = 0;
 				}else{
-					$randdata[$i]['change'] = $oldrand[$randdata[$i][$field]] - $rand;
+					$randdata[$i]['change'] = $rand - $oldrand[$randdata[$i][$field]];
 				}
 
 			}else{