diff --git a/inventory-backend/app/services/inbound/buy_service.py b/inventory-backend/app/services/inbound/buy_service.py
index dcb6a08..1a12ebb 100644
--- a/inventory-backend/app/services/inbound/buy_service.py
+++ b/inventory-backend/app/services/inbound/buy_service.py
@@ -59,6 +59,11 @@ class BuyInboundService:
                     )
                 ))
 
+            # ★ 行级公司隔离：只能搜索/选择本公司的物料（超管/跨域不受限）
+            from app.utils.decorators import get_current_company_filter
+            company_limit = get_current_company_filter()
+            if company_limit is not None:
+                query = query.filter(MaterialBase.company_name == company_limit)
             query = query.order_by(MaterialBase.id.desc())
             pagination = query.paginate(page=page, per_page=limit, error_out=False)
 
diff --git a/inventory-backend/app/services/inbound/product_service.py b/inventory-backend/app/services/inbound/product_service.py
index 15a76e3..036582a 100644
--- a/inventory-backend/app/services/inbound/product_service.py
+++ b/inventory-backend/app/services/inbound/product_service.py
@@ -43,6 +43,11 @@ class ProductInboundService:
                         MaterialBase.company_name.ilike(kw)
                     )
                 )
+            # ★ 行级公司隔离：只能搜索/选择本公司的物料（超管/跨域不受限）
+            from app.utils.decorators import get_current_company_filter
+            company_limit = get_current_company_filter()
+            if company_limit is not None:
+                query = query.filter(MaterialBase.company_name == company_limit)
             query = query.order_by(MaterialBase.id.desc())
             pagination = query.paginate(page=page, per_page=limit, error_out=False)
             results = []
diff --git a/inventory-backend/app/services/inbound/semi_service.py b/inventory-backend/app/services/inbound/semi_service.py
index 3cb3cc6..1814ee8 100644
--- a/inventory-backend/app/services/inbound/semi_service.py
+++ b/inventory-backend/app/services/inbound/semi_service.py
@@ -53,6 +53,11 @@ class SemiInboundService:
                         MaterialBase.company_name.ilike(kw)
                     )
                 )
+            # ★ 行级公司隔离：只能搜索/选择本公司的物料（超管/跨域不受限）
+            from app.utils.decorators import get_current_company_filter
+            company_limit = get_current_company_filter()
+            if company_limit is not None:
+                query = query.filter(MaterialBase.company_name == company_limit)
             query = query.order_by(MaterialBase.id.desc())
             pagination = query.paginate(page=page, per_page=limit, error_out=False)
             results = []
diff --git a/inventory-backend/app/services/inbound/service_service.py b/inventory-backend/app/services/inbound/service_service.py
index 980e101..2ca9035 100644
--- a/inventory-backend/app/services/inbound/service_service.py
+++ b/inventory-backend/app/services/inbound/service_service.py
@@ -55,6 +55,11 @@ class ServiceService:
                         MaterialBase.spec_model.ilike(f'%{keyword}%'),
                     )
                 )
+            # ★ 行级公司隔离：只能搜索/选择本公司的物料（超管/跨域不受限）
+            from app.utils.decorators import get_current_company_filter
+            company_limit = get_current_company_filter()
+            if company_limit is not None:
+                query = query.filter(MaterialBase.company_name == company_limit)
             query = query.order_by(MaterialBase.id.desc()).limit(20)
 
             results = []