diff --git a/ICSSoft.WMS.WebAPI/ICSSoft.DataProject/ICSWareHouseLotInfoService.cs b/ICSSoft.WMS.WebAPI/ICSSoft.DataProject/ICSWareHouseLotInfoService.cs
index 71ede0e..ef373dd 100644
--- a/ICSSoft.WMS.WebAPI/ICSSoft.DataProject/ICSWareHouseLotInfoService.cs
+++ b/ICSSoft.WMS.WebAPI/ICSSoft.DataProject/ICSWareHouseLotInfoService.cs
@@ -1229,7 +1229,7 @@ namespace ICSSoft.DataProject
                             RETURN
                         END
 
-                        UPDATE ICSWareHouseLotInfo SET WarehouseCode='{2}',LocationCode='{3}',Quantity='{4}' WHERE LotNo='{0}' AND WorkPoint='{1}'
+                        UPDATE ICSWareHouseLotInfo SET WarehouseCode='{2}',LocationCode='{3}',Quantity=Quantity+'{4}' WHERE LotNo='{0}' AND WorkPoint='{1}'
                         ";
                 sql = string.Format(sql, LotNo, WorkPoint, WarehouseCode, LocationCode, Quantity);