diff --git a/src/main/java/com/spring/modules/part/entity/BomMultiLevelStructureData.java b/src/main/java/com/spring/modules/part/entity/BomMultiLevelStructureData.java
index d51d2691..5d0ef52d 100644
--- a/src/main/java/com/spring/modules/part/entity/BomMultiLevelStructureData.java
+++ b/src/main/java/com/spring/modules/part/entity/BomMultiLevelStructureData.java
@@ -8,6 +8,10 @@ import java.math.BigDecimal;
 
 @Data
 public class BomMultiLevelStructureData {
+    /**
+     * 结构层级（根下第一层为 1，对应 IFS MANUF_STRUCTURE.LEVEL）
+     **/
+    private Integer structureLevel;
     /**
      * 工厂
      **/
diff --git a/src/main/resources/mapper/part/BomManagementMapper.xml b/src/main/resources/mapper/part/BomManagementMapper.xml
index 4cac190f..5fef4020 100644
--- a/src/main/resources/mapper/part/BomManagementMapper.xml
+++ b/src/main/resources/mapper/part/BomManagementMapper.xml
@@ -877,34 +877,127 @@
         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>
 
-    <!-- 查bom子明细 -->
+    <!-- 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）。 -->
     <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 (
+            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
+            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}
+              AND a.eng_chg_level = #{engChgLevel}
+              AND a.alternative_no = #{alternativeNo}
+              AND a.qty_per_assembly &gt;= 0
+
+            UNION ALL
+
+            SELECT
+                p.structure_level + 1,
+                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
+            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_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
-            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
-        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} and a.eng_chg_level = #{engChgLevel} and a.alternative_no = #{alternativeNo}
+            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
     </select>
 
     <!-- 新增BOM子明细表内容 -->