diff --git a/sgzb-modules/sgzb-material/src/main/resources/mapper/app/BackReceiveMapper.xml b/sgzb-modules/sgzb-material/src/main/resources/mapper/app/BackReceiveMapper.xml
index 51923ca..5930e32 100644
--- a/sgzb-modules/sgzb-material/src/main/resources/mapper/app/BackReceiveMapper.xml
+++ b/sgzb-modules/sgzb-material/src/main/resources/mapper/app/BackReceiveMapper.xml
@@ -672,7 +672,7 @@
       bad.pre_num as preNum,
       bad.audit_num as auditNum,
       bad.status as status,
-      IFNULL(sai.num, 0) as max_back_num,
+      IFNULL(sai.num, 0)-IFNULL(aa.back_num,0) as max_back_num,
       IFNULL(aa.back_num,0) as in_completed_back_num,
       IFNULL(bb.finished_back_num, 0) as finished_back_num,
       mt.manage_type as manageType,
@@ -730,7 +730,7 @@
     bad.pre_num as preNum,
     bad.audit_num as auditNum,
     bad.status as status,
-    IFNULL(sai.num, 0) as max_back_num,
+    IFNULL(sai.num, 0)-IFNULL(aa.back_num,0) as max_back_num,
     IFNULL(aa.back_num,0) as in_completed_back_num,
     IFNULL(bb.finished_back_num, 0) as finished_back_num,
     mt.manage_type as manageType,