diff --git a/source/application/common/logic/PassFlow.php b/source/application/common/logic/PassFlow.php
index 7d34a47..3a1225c 100644
--- a/source/application/common/logic/PassFlow.php
+++ b/source/application/common/logic/PassFlow.php
@@ -368,7 +368,7 @@ class PassFlow
         }
         $libData = $dm->select('bt_library',['group_id' => ['baz001','BAF055']]);
         foreach ($libData as $libRow) {
-            $holdValue = $libRow['today_incount'] - $libRow['today_outcount'];
+            $holdValue = abs($libRow['today_incount'] - $libRow['today_outcount']);
             $libProportion = $holdValue > 0 ? round($holdValue/$groupThreshold[$libRow['group_id']],4) : 0;
             // 文化馆排 4# 图书馆 2#
             $isort = $libRow['group_id']=='baz001'?2:4;