diff --git a/inventory-backend/app/services/bom_service.py b/inventory-backend/app/services/bom_service.py
index 0839027..9c2962c 100644
--- a/inventory-backend/app/services/bom_service.py
+++ b/inventory-backend/app/services/bom_service.py
@@ -91,15 +91,15 @@ class BomService:
 
         results.sort(key=lambda x: (x['bom_no'], x['version']), reverse=True)
 
-        # 如果有关键词，过滤结果（keyword 匹配逻辑保持不变）
+        # 如果有关键词，二次过滤结果（忽略大小写）
         if keyword:
-            kw = f'%{keyword}%'
+            kw = keyword.lower()
             results = [
                 r for r in results
-                if kw in (r.get('parent_name') or '')
-                   or kw in (r.get('parent_spec') or '')
-                   or kw in (r.get('bom_no') or '')
-                   or kw in (r.get('parent_category') or '')
+                if kw in (r.get('parent_name') or '').lower()
+                   or kw in (r.get('parent_spec') or '').lower()
+                   or kw in (r.get('bom_no') or '').lower()
+                   or kw in (r.get('parent_category') or '').lower()
             ]
 
         # 按 parent_category 分组