diff --git a/backend/app/Controller/Api/V1/RawRefundItemController.php b/backend/app/Controller/Api/V1/RawRefundItemController.php
index 71e50e5..5661192 100644
--- a/backend/app/Controller/Api/V1/RawRefundItemController.php
+++ b/backend/app/Controller/Api/V1/RawRefundItemController.php
@@ -63,6 +63,7 @@ class RawRefundItemController extends RefundItemController
             new OA\Parameter(name: 'refund_type_id', in: 'query', required: false, description: '退款类型 ID 精确筛选', schema: new OA\Schema(type: 'integer')),
             new OA\Parameter(name: 'platform_refund_id', in: 'query', required: false, description: '平台退款子项 ID 精确搜索', schema: new OA\Schema(type: 'string')),
             new OA\Parameter(name: 'platform_order_id', in: 'query', required: false, description: '关联平台订单 ID 筛选', schema: new OA\Schema(type: 'string')),
+            new OA\Parameter(name: 'platform_product_id', in: 'query', required: false, description: '平台商品 ID 精确筛选', schema: new OA\Schema(type: 'string')),
             new OA\Parameter(name: 'created_date_from', in: 'query', required: false, description: '创建时间起始（含）', schema: new OA\Schema(type: 'string', format: 'date')),
             new OA\Parameter(name: 'created_date_to', in: 'query', required: false, description: '创建时间截止（含）', schema: new OA\Schema(type: 'string', format: 'date')),
         ],
diff --git a/backend/app/Controller/Api/V1/RefundItemController.php b/backend/app/Controller/Api/V1/RefundItemController.php
index 77ee427..af6725a 100644
--- a/backend/app/Controller/Api/V1/RefundItemController.php
+++ b/backend/app/Controller/Api/V1/RefundItemController.php
@@ -66,6 +66,7 @@ class RefundItemController extends AbstractDataController
             'refund_type_id' => 'exact',
             'platform_refund_id' => 'exact',
             'platform_order_id' => 'exact',
+            'platform_product_id' => 'exact',
             'created_date_from' => 'date_from',
             'created_date_to' => 'date_to',
         ];
@@ -96,6 +97,7 @@ class RefundItemController extends AbstractDataController
             new OA\Parameter(name: 'refund_type_id', in: 'query', required: false, description: '退款类型 ID 精确筛选（1=仅退款 2=退货退款 3=补偿退款）', schema: new OA\Schema(type: 'integer')),
             new OA\Parameter(name: 'platform_refund_id', in: 'query', required: false, description: '平台退款子项 ID 精确搜索', schema: new OA\Schema(type: 'string')),
             new OA\Parameter(name: 'platform_order_id', in: 'query', required: false, description: '关联平台订单 ID 筛选', schema: new OA\Schema(type: 'string')),
+            new OA\Parameter(name: 'platform_product_id', in: 'query', required: false, description: '平台商品 ID 精确筛选', schema: new OA\Schema(type: 'string')),
             new OA\Parameter(name: 'created_date_from', in: 'query', required: false, description: '创建时间起始（含）', schema: new OA\Schema(type: 'string', format: 'date', example: '2026-01-01')),
             new OA\Parameter(name: 'created_date_to', in: 'query', required: false, description: '创建时间截止（含）', schema: new OA\Schema(type: 'string', format: 'date', example: '2026-12-31')),
         ],