diff --git a/seata-storage-service2002/src/main/resources/mapper/StorageMapper.xml b/seata-storage-service2002/src/main/resources/mapper/StorageMapper.xml
index 2127e9a9ed224145f5b12bf70a0f4079f4f8753b..93ad3af2045b9c57a66eb5a07693480fec906fd5 100644
--- a/seata-storage-service2002/src/main/resources/mapper/StorageMapper.xml
+++ b/seata-storage-service2002/src/main/resources/mapper/StorageMapper.xml
@@ -15,7 +15,7 @@
     <!--减库存-->
     <update id="decrease">
         update t_storage
-        set used =used + #{count},residue=#{count}
+        set used =used + #{count},residue =residue - #{count} 
         where product_id=#{productId};
     </update>
 </mapper>
\ No newline at end of file