diff --git a/backend/app/services/product_service.py b/backend/app/services/product_service.py
index d0aa329..f661562 100644
--- a/backend/app/services/product_service.py
+++ b/backend/app/services/product_service.py
@@ -96,7 +96,6 @@ async def get_product_by_serial(db: AsyncSession, serial_number: str) -> Product
         all_task_ids.append(t.id)
         if t.assignee_id: assignee_ids.add(t.assignee_id)
     _collect_ids(task_tree)
-    assignee_names = _lookup_display_names(list(assignee_ids))
 
     # 🔧 批量查 task_logs: 谁创建了每个任务
     creator_map: dict[uuid.UUID, str] = {}
@@ -125,15 +124,20 @@ async def get_product_by_serial(db: AsyncSession, serial_number: str) -> Product
             if row[1]:
                 creator_map[row[0]] = row[1]
 
-    # 注入 created_by 到 task_tree 和 top_tasks
+    # 注入 created_by 到 task_tree 和 top_tasks（并收集 created_by 到中文名映射）
     def _inject_creator(tasks):
         for t in tasks:
             t.created_by = creator_map.get(t.id)
+            if t.created_by: assignee_ids.add(t.created_by)
             if t.child_tasks:
                 _inject_creator(t.child_tasks)
     _inject_creator(task_tree)
     for t in top_tasks:
         t.created_by = creator_map.get(t.id)
+        if t.created_by: assignee_ids.add(t.created_by)
+
+    # 🔧 中文名映射（负责人 + 创建人，供前端显示"谁转入在库"等）
+    assignee_names = _lookup_display_names(list(assignee_ids))
 
     return ProductScanResponse(
         id=product.id,