diff --git a/src/main/resources/mapper/part/BomManagementMapper.xml b/src/main/resources/mapper/part/BomManagementMapper.xml
index 5fef4020..0b7d6eac 100644
--- a/src/main/resources/mapper/part/BomManagementMapper.xml
+++ b/src/main/resources/mapper/part/BomManagementMapper.xml
@@ -877,59 +877,21 @@
         where site = #{site} and part_no = #{partNo} and eng_chg_level = #{engChgLevel} and bom_type = #{bomType} and alternative_no = #{alternativeNo} and by_prod_line_item_no = #{byProdLineItemNo} and component_line_item_no = #{componentLineItemNo}
     </update>
 
-    <!-- 多层级 BOM 展开：IFS CONNECT BY 语义；子装配解析在 DefaultChildBom（非递归）中完成。递归成员仅 INNER JOIN，避免 SQL Server 对递归 CTE 的限制（禁止派生表/子查询/外连接/OPTION）。 -->
+    <!-- 多层级 BOM 展开：IFS CONNECT BY 语义。直接在递归成员中 JOIN 有效版本，避免使用 ROW_NUMBER() 导致全表扫描。 -->
     <select id="queryBomMultiLevelStructureList" parameterType="BomDetailEntity" resultType="BomMultiLevelStructureData">
-        WITH DefaultChildBom AS (
-            SELECT pick.site, pick.part_no, pick.bom_type, pick.eng_chg_level, pick.alternative_no
-            FROM (
-                SELECT bd.site,
-                       bd.part_no,
-                       bd.bom_type,
-                       bd.eng_chg_level,
-                       bd.alternative_no,
-                       ROW_NUMBER() OVER (
-                           PARTITION BY bd.site, bd.part_no, bd.bom_type
-                           ORDER BY bh.eff_phase_in_date DESC, bh.create_date DESC
-                       ) AS rn
-                FROM plm_bom_detail bd
-                INNER JOIN plm_bom_header bh ON bd.site = bh.site AND bd.part_no = bh.part_no
-                    AND bd.bom_type = bh.bom_type AND bd.eng_chg_level = bh.eng_chg_level
-                INNER JOIN part_revision pr ON pr.site = bh.site AND pr.part_no = bh.part_no AND pr.eng_chg_level = bh.eng_chg_level
-                WHERE bd.alternative_no = '*'
-                  AND pr.eff_phase_out_date IS NULL
-                  AND ISNULL(bd.status, '') <![CDATA[<>]]> 'Obsolete'
-            ) pick
-            WHERE pick.rn = 1
-        ),
-        ExplodedBom AS (
+        WITH ExplodedBom AS (
             SELECT
                 1 AS structure_level,
                 CAST(RIGHT(REPLICATE('0', 8) + CAST(a.line_sequence AS VARCHAR(8)), 8) AS VARCHAR(8000)) AS sort_key,
                 a.site,
                 a.part_no,
-                dbo.get_part_name(a.site, a.part_no) AS partDesc,
                 a.bom_type,
                 a.eng_chg_level,
                 a.alternative_no,
-                b.alternative_description,
                 a.component_part,
-                dbo.get_part_name(a.site, a.component_part) AS componentPartDesc,
                 a.qty_per_assembly,
-                a.print_unit,
-                dbo.get_um_name(a.print_unit) AS printUnitName,
-                c.product_group_id4,
-                dbo.get_product_group_name(c.site, c.product_group_id4, '4') AS productGroupName4,
-                c.min_order_qty,
-                c.mul_order_qty,
-                c.planning_method,
-                c.cum_lead_time,
-                c.unprotected_lead_time,
-                dbo.get_cum_lead_time(a.site, a.component_part) AS componentCumLeadTime,
-                dbo.get_unprotected_lead_time(a.site, a.component_part) AS componentUnprotectedLeadTime
+                a.print_unit
             FROM plm_bom_component AS a
-            LEFT JOIN plm_bom_detail AS b ON a.site = b.site AND a.part_no = b.part_no AND a.bom_type = b.bom_type
-                AND a.eng_chg_level = b.eng_chg_level AND a.alternative_no = b.alternative_no
-            LEFT JOIN part AS c ON a.site = c.site AND a.part_no = c.part_no
             WHERE a.site = #{site}
               AND a.part_no = #{partNo}
               AND a.bom_type = #{bomType}
@@ -944,60 +906,54 @@
                 CAST(p.sort_key + '.' + RIGHT(REPLICATE('0', 8) + CAST(a.line_sequence AS VARCHAR(8)), 8) AS VARCHAR(8000)),
                 a.site,
                 a.part_no,
-                dbo.get_part_name(a.site, a.part_no) AS partDesc,
                 a.bom_type,
                 a.eng_chg_level,
                 a.alternative_no,
-                b.alternative_description,
                 a.component_part,
-                dbo.get_part_name(a.site, a.component_part) AS componentPartDesc,
                 a.qty_per_assembly,
-                a.print_unit,
-                dbo.get_um_name(a.print_unit) AS printUnitName,
-                c.product_group_id4,
-                dbo.get_product_group_name(c.site, c.product_group_id4, '4') AS productGroupName4,
-                c.min_order_qty,
-                c.mul_order_qty,
-                c.planning_method,
-                c.cum_lead_time,
-                c.unprotected_lead_time,
-                dbo.get_cum_lead_time(a.site, a.component_part) AS componentCumLeadTime,
-                dbo.get_unprotected_lead_time(a.site, a.component_part) AS componentUnprotectedLeadTime
+                a.print_unit
             FROM ExplodedBom AS p
-            INNER JOIN DefaultChildBom AS cb ON cb.site = p.site AND cb.part_no = p.component_part AND cb.bom_type = p.bom_type
+            INNER JOIN plm_bom_detail AS cb ON cb.site = p.site AND cb.part_no = p.component_part AND cb.bom_type = p.bom_type
+                AND cb.alternative_no = '*' AND ISNULL(cb.status, '') <![CDATA[<>]]> 'Obsolete'
+            INNER JOIN part_revision AS cpr ON cpr.site = cb.site AND cpr.part_no = cb.part_no AND cpr.eng_chg_level = cb.eng_chg_level
+                AND cpr.eff_phase_out_date IS NULL
             INNER JOIN plm_bom_component AS a ON a.site = cb.site AND a.part_no = cb.part_no
                 AND a.bom_type = cb.bom_type AND a.eng_chg_level = cb.eng_chg_level AND a.alternative_no = cb.alternative_no
-            INNER JOIN plm_bom_detail AS b ON a.site = b.site AND a.part_no = b.part_no AND a.bom_type = b.bom_type
-                AND a.eng_chg_level = b.eng_chg_level AND a.alternative_no = b.alternative_no
-            INNER JOIN part AS c ON a.site = c.site AND a.part_no = c.part_no
             WHERE p.structure_level &lt; 100
               AND a.qty_per_assembly &gt;= 0
         )
         SELECT
-            structure_level,
-            site,
-            part_no,
-            partDesc,
-            bom_type,
-            eng_chg_level,
-            alternative_no,
-            alternative_description,
-            component_part,
-            componentPartDesc,
-            qty_per_assembly,
-            print_unit,
-            printUnitName,
-            product_group_id4,
-            productGroupName4,
-            min_order_qty,
-            mul_order_qty,
-            planning_method,
-            cum_lead_time,
-            unprotected_lead_time,
-            componentCumLeadTime,
-            componentUnprotectedLeadTime
-        FROM ExplodedBom
-        ORDER BY sort_key
+            eb.structure_level,
+            eb.site,
+            eb.part_no,
+            dbo.get_part_name(eb.site, eb.part_no) AS partDesc,
+            eb.bom_type,
+            eb.eng_chg_level,
+            eb.alternative_no,
+            b.alternative_description,
+            eb.component_part,
+            dbo.get_part_name(eb.site, eb.component_part) AS componentPartDesc,
+            eb.qty_per_assembly,
+            eb.print_unit,
+            dbo.get_um_name(eb.print_unit) AS printUnitName,
+            c.product_group_id4,
+            dbo.get_product_group_name(c.site, c.product_group_id4, '4') AS productGroupName4,
+            c.min_order_qty,
+            c.mul_order_qty,
+            c.planning_method,
+            c.cum_lead_time,
+            c.unprotected_lead_time,
+            dbo.get_cum_lead_time(eb.site, eb.component_part) AS componentCumLeadTime,
+            dbo.get_unprotected_lead_time(eb.site, eb.component_part) AS componentUnprotectedLeadTime
+        FROM (
+            SELECT *, ROW_NUMBER() OVER(PARTITION BY sort_key ORDER BY eng_chg_level DESC) as rn
+            FROM ExplodedBom
+        ) eb
+        LEFT JOIN plm_bom_detail AS b ON eb.site = b.site AND eb.part_no = b.part_no AND eb.bom_type = b.bom_type
+            AND eb.eng_chg_level = b.eng_chg_level AND eb.alternative_no = b.alternative_no
+        LEFT JOIN part AS c ON eb.site = c.site AND eb.part_no = c.part_no
+        WHERE eb.rn = 1
+        ORDER BY eb.sort_key
     </select>
 
     <!-- 新增BOM子明细表内容 -->