diff --git a/mhd_oms/src/main/java/com/mhd/oms/interfaces/facade/reservationMaterialInventory/ReservationMaterialInventoryApi.java b/mhd_oms/src/main/java/com/mhd/oms/interfaces/facade/reservationMaterialInventory/ReservationMaterialInventoryApi.java
index f21b4f593..80282b72b 100644
--- a/mhd_oms/src/main/java/com/mhd/oms/interfaces/facade/reservationMaterialInventory/ReservationMaterialInventoryApi.java
+++ b/mhd_oms/src/main/java/com/mhd/oms/interfaces/facade/reservationMaterialInventory/ReservationMaterialInventoryApi.java
@@ -84,16 +84,10 @@ public class ReservationMaterialInventoryApi extends BaseController {
         materialInventoryDO.setExpiryDateEnd(expiryDateEnd);
         startPage();
         // 使用带批次属性的查询方法，批次属性值从库存表中获取
+        // 排序由 SQL 统一处理：到期日倒序(日期近的在前、空值最后)、同到期日按更新时间倒序(空值最后)，
+        // 查询列表与导出（同一接口）均按到期日分组，相同到期日的数据相邻显示；
+        // 不在内存重排，避免覆盖 SQL 排序导致跨页分组被打散
         List<ReservationMaterialInventoryPO> list = materialInventoryApplicationService.queryListWithBatchAttributes(materialInventoryDO);
-        // 按更新时间倒序排序；update_time 为空的数据放最后
-        list.sort((o1, o2) -> {
-            Date t1 = o1.getUpdateTime();
-            Date t2 = o2.getUpdateTime();
-            if (t1 == null && t2 == null) return 0;
-            if (t1 == null) return 1;
-            if (t2 == null) return -1;
-            return t2.compareTo(t1); // desc
-        });
         TableDataInfo tableDataInfo = getDataTable(list);
         return tableDataInfo;
     }
diff --git a/mhd_oms/src/main/resources/mapper/reservationMaterialInventory/MaterialInventoryMapper.xml b/mhd_oms/src/main/resources/mapper/reservationMaterialInventory/MaterialInventoryMapper.xml
index 8e11d236b..ce58f8970 100644
--- a/mhd_oms/src/main/resources/mapper/reservationMaterialInventory/MaterialInventoryMapper.xml
+++ b/mhd_oms/src/main/resources/mapper/reservationMaterialInventory/MaterialInventoryMapper.xml
@@ -292,7 +292,11 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
             <include refid="selectMaterialInventoryPo1"/>
             <include refid="JoinMaterialBaseInfoPoWhere"/>
         </where>
-        group by a.MATERIAL_INVENTORY_ID order by a.update_time desc
+        group by a.MATERIAL_INVENTORY_ID
+        <!-- 按到期日分组归类：到期日倒序(日期近的在前)、空值放最后；同到期日按更新时间倒序(空值放最后)。
+             查询列表与导出共用本查询，相同到期日的数据相邻显示；排序放 SQL 层保证跨页/全量导出分组不被打散 -->
+        order by CASE WHEN a.expiry_date IS NULL THEN 1 ELSE 0 END ASC, a.expiry_date DESC,
+                 CASE WHEN a.update_time IS NULL THEN 1 ELSE 0 END ASC, a.update_time DESC
     </select>
 
     <select id="queryListByWlKw" parameterType="com.mhd.oms.domain.reservationMaterialInventory.repository.todo.ReservationMaterialInventoryDO" resultMap="MaterialInventoryResult">