diff --git a/ruoyi-admin/src/main/java/com/ruoyi/web/controller/tyre/BizMaintenanceOrderController.java b/ruoyi-admin/src/main/java/com/ruoyi/web/controller/tyre/BizMaintenanceOrderController.java
index aeffcf02..b20039f7 100644
--- a/ruoyi-admin/src/main/java/com/ruoyi/web/controller/tyre/BizMaintenanceOrderController.java
+++ b/ruoyi-admin/src/main/java/com/ruoyi/web/controller/tyre/BizMaintenanceOrderController.java
@@ -141,17 +141,11 @@ public class BizMaintenanceOrderController extends BaseController
     {
         BizMaintenanceOrder bizMaintenanceOrder = bizMaintenanceOrderService.selectBizMaintenanceOrderByOrderId(orderId);
         mmap.put("bizMaintenanceOrder", bizMaintenanceOrder);
-        //查询前一个工单
+        // 查询同车牌上一张已完成维保工单；“维保前”按业务口径取上一单的维保后结果，不能再混入当前车辆实时装胎状态。
         BizMaintenanceOrder bizMaintenanceOrderBefore = bizMaintenanceOrderService.selectBizMaintenanceOrderByOrderIdBefore(bizMaintenanceOrder);
         BizOrderTireDetail bizOrderTireDetail = new BizOrderTireDetail();
         List<Map> bizOrderTireDetailsBefore = new ArrayList<>();
-        if (bizMaintenanceOrderBefore==null){
-            //如果上一次的检查结果为空
-            //则数据为车辆目前的安装数据
-            //查询此车辆安装的轮胎数据
-            bizOrderTireDetailsBefore = bizOrderTireDetailService.selectBaseTrieInstall(bizMaintenanceOrder.getPlateNumber());
-
-        }else {
+        if (bizMaintenanceOrderBefore != null){
             bizOrderTireDetail.setOrderId(bizMaintenanceOrderBefore.getOrderId());
             bizOrderTireDetailsBefore = bizOrderTireDetailService.selectBizOrderTireDetail(bizOrderTireDetail);
         }
diff --git a/ruoyi-system/src/main/resources/mapper/tyre/BizMaintenanceOrderMapper.xml b/ruoyi-system/src/main/resources/mapper/tyre/BizMaintenanceOrderMapper.xml
index 360409de..5e78608f 100644
--- a/ruoyi-system/src/main/resources/mapper/tyre/BizMaintenanceOrderMapper.xml
+++ b/ruoyi-system/src/main/resources/mapper/tyre/BizMaintenanceOrderMapper.xml
@@ -124,6 +124,27 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     </select>
     <select id="selectBizMaintenanceOrderByOrderIdBefore"
             resultMap="BizMaintenanceOrderResult" parameterType="BizMaintenanceOrder">
+        SELECT
+            order_id,
+            order_no,
+            vehicle_id,
+            plate_number,
+            type_code,
+            factoryName,
+            input_mileage,
+            last_mileage,
+            maintain_date,
+            description,
+            status,
+            order_type,
+            create_by,
+            create_time,
+            update_by,
+            update_time,
+            remark,
+            line
+        FROM
+        (
         SELECT
             order_id,
             order_no,
@@ -142,7 +163,8 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
             sus.user_name as update_by,
             bmo.update_time,
             bmo.remark,
-            bc.line
+            bc.line,
+            ROW_NUMBER() OVER (ORDER BY bmo.create_time DESC, bmo.order_id DESC) AS rn
         FROM
             biz_maintenance_order bmo
                 LEFT JOIN sys_dept sd ON bmo.factory_id = sd.dept_id
@@ -152,9 +174,18 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         WHERE
             bmo.order_id != #{orderId}
             AND bmo.plate_number = #{plateNumber}
-        ORDER BY
-            bmo.create_time DESC  -- 关键点1：按照维保日期倒序排列（最近的时间在前）
-            LIMIT 1;                    -- 关键点2：只取第一条数据
+            AND bmo.status = 'COMPLETED'
+            AND bmo.type_code IN ('1', '4')
+            <!-- 维保前按“上一张已完成维保工单的维保后结果”取数，必须排除当前工单之后创建的完成单。 -->
+            <if test="createTime != null">
+                AND (bmo.create_time &lt; #{createTime}
+                    OR (bmo.create_time = #{createTime} AND bmo.order_id &lt; #{orderId}))
+            </if>
+            <if test="createTime == null">
+                AND bmo.order_id &lt; #{orderId}
+            </if>
+        ) prev_order
+        WHERE prev_order.rn = 1
     </select>
 
     <insert id="insertBizMaintenanceOrder" parameterType="BizMaintenanceOrder" useGeneratedKeys="true" keyProperty="orderId">
@@ -231,4 +262,4 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         </foreach>
     </delete>
 
-</mapper>
\ No newline at end of file
+</mapper>