diff --git a/inventory-backend/app/services/bom_service.py b/inventory-backend/app/services/bom_service.py
index 2941fb3..d6e0cf0 100644
--- a/inventory-backend/app/services/bom_service.py
+++ b/inventory-backend/app/services/bom_service.py
@@ -293,7 +293,8 @@ class BomService:
             BomTable,
             MaterialBase.name.label('child_name'),
             MaterialBase.spec_model.label('child_spec')
-        ).join(
+        ).outerjoin(
+            # ★ LEFT JOIN：子件物料被删除后仍返回父件 BOM 结构，避免误报 "BOM 不存在"
             MaterialBase, BomTable.child_id == MaterialBase.id
         ).filter(
             BomTable.bom_no == bom_no
@@ -322,7 +323,7 @@ class BomService:
         for bom, child_name, child_spec in rows:
             children.append({
                 'child_id': bom.child_id,
-                'child_name': child_name,
+                'child_name': child_name or '[已删除物料]',
                 'child_spec': child_spec or '',
                 'dosage': float(bom.dosage) if bom.dosage else 0.0,
                 'remark': bom.remark or ''