diff --git a/inventory-backend/app/services/inbound/buy_service.py b/inventory-backend/app/services/inbound/buy_service.py
index 22e4040..dcb6a08 100644
--- a/inventory-backend/app/services/inbound/buy_service.py
+++ b/inventory-backend/app/services/inbound/buy_service.py
@@ -279,6 +279,7 @@ class BuyInboundService:
             for k, v in field_mapping.items():
                 if k in data: setattr(stock, v, data[k])
 
+            # ★ 仅当 payload 明确携带 arrival_photo 时才更新（含 [] 表示清空）；改其它字段不动图片
             if 'arrival_photo' in data:
                 new_photo_list = data['arrival_photo']
                 stock.arrival_photo = json.dumps(new_photo_list)
@@ -293,11 +294,11 @@ class BuyInboundService:
                         stock.id,
                         new_photo_list
                     )
-            else:
-                stock.arrival_photo = None
-                ImageEmbeddingService.delete_embeddings(
-                    ImageEmbeddingService.MODULE_STOCK_BUY, stock.id
-                )
+                else:
+                    # 图片被清空([])时，同步清理该记录的图片向量
+                    ImageEmbeddingService.delete_embeddings(
+                        ImageEmbeddingService.MODULE_STOCK_BUY, stock.id
+                    )
 
             if 'inspection_report' in data: stock.inspection_report = json.dumps(data['inspection_report'])
 
diff --git a/inventory-backend/app/services/inbound/product_service.py b/inventory-backend/app/services/inbound/product_service.py
index 99a7db7..15a76e3 100644
--- a/inventory-backend/app/services/inbound/product_service.py
+++ b/inventory-backend/app/services/inbound/product_service.py
@@ -250,6 +250,7 @@ class ProductInboundService:
             for f in fields:
                 if f in data: setattr(stock, f, data[f])
 
+            # ★ 仅当 payload 明确携带 product_photo 时才更新（含 [] 表示清空）；改其它字段不动图片
             if 'product_photo' in data:
                 new_photo_list = data['product_photo']
                 stock.product_photo = json.dumps(new_photo_list)
@@ -264,11 +265,11 @@ class ProductInboundService:
                         stock.id,
                         new_photo_list
                     )
-            else:
-                stock.product_photo = None
-                ImageEmbeddingService.delete_embeddings(
-                    ImageEmbeddingService.MODULE_STOCK_PRODUCT, stock.id
-                )
+                else:
+                    # 图片被清空([])时，同步清理该记录的图片向量
+                    ImageEmbeddingService.delete_embeddings(
+                        ImageEmbeddingService.MODULE_STOCK_PRODUCT, stock.id
+                    )
             if 'quality_report_link' in data:
                 imgs = data['quality_report_link']
                 if isinstance(imgs, list): stock.quality_report_link = json.dumps(imgs)
diff --git a/inventory-backend/app/services/inbound/semi_service.py b/inventory-backend/app/services/inbound/semi_service.py
index 609e4bd..3cb3cc6 100644
--- a/inventory-backend/app/services/inbound/semi_service.py
+++ b/inventory-backend/app/services/inbound/semi_service.py
@@ -307,6 +307,7 @@ class SemiInboundService:
                 if frontend_key in data:
                     setattr(stock, db_attr, data[frontend_key])
 
+            # ★ 仅当 payload 明确携带 arrival_photo 时才更新（含 [] 表示清空）；改其它字段不动图片
             if 'arrival_photo' in data:
                 new_photo_list = data['arrival_photo']
                 stock.arrival_photo = json.dumps(new_photo_list)
@@ -321,11 +322,11 @@ class SemiInboundService:
                         stock.id,
                         new_photo_list
                     )
-            else:
-                stock.arrival_photo = None
-                ImageEmbeddingService.delete_embeddings(
-                    ImageEmbeddingService.MODULE_STOCK_SEMI, stock.id
-                )
+                else:
+                    # 图片被清空([])时，同步清理该记录的图片向量
+                    ImageEmbeddingService.delete_embeddings(
+                        ImageEmbeddingService.MODULE_STOCK_SEMI, stock.id
+                    )
             if 'quality_report_link' in data:
                 imgs = data['quality_report_link']
                 if isinstance(imgs, list):