diff --git a/backend/application/common/service/OrderService.php b/backend/application/common/service/OrderService.php
index 1dc3848..801cde7 100644
--- a/backend/application/common/service/OrderService.php
+++ b/backend/application/common/service/OrderService.php
@@ -19,6 +19,8 @@ class OrderService
 
     const LOCK_ORDER_PREFIX = 'lock_order_cache:'; //重复创建订单锁
 
+    const DEFAULT_SAAS_ID = '1000'; //默认商家ID(fa_orders.saas_id 为 NOT NULL 且无默认值,商品无归属时兜底)
+
     //订单状态
     const ORDER_STATUS_NO = 0; //关闭
     const ORDER_STATUS_WAIT_PAY = 10; //待付款
@@ -125,18 +127,26 @@ class OrderService
                     'goods_payment_price' => $item['price'],
                 ];
             }
+            // saas_id 取商品归属商家,取不到时用默认值(fa_orders.saas_id 不允许为空且无默认值)
+            $goodsInfo = GoodsService::getOne(['spu_id' => $goodsRequestList[0]['spuId'] ?? '']);
+            $saasId = ($goodsInfo && !empty($goodsInfo->saas_id)) ? $goodsInfo->saas_id : self::DEFAULT_SAAS_ID;
+            $storeInfo = $requestData['storeInfoList'][0] ?? [];
             $orderData = [
                 'user_id' => $userId,
-                'store_id' => 1,
+                'saas_id' => $saasId,
+                'store_id' => $storeInfo['storeId'] ?? ($goodsRequestList[0]['storeId'] ?? 1),
+                'store_name' => $storeInfo['storeName'] ?? '',
+                'parent_order_no' => '', // 单订单无父子关系,稍后回填为自身订单号
                 'order_no' => generate_order_sn(),
                 'order_status' => OrderService::ORDER_STATUS_WAIT_PAY,
                 'order_type' => 0,
                 'total_amount' => $total_amount,
                 'payment_amount' => $total_amount,
-                'goods_amount' => $total_quantity,
+                'goods_amount' => $total_amount,
                 'discount_amount' => 0,
-                'remark' => $requestData['storeInfoList'][0]['remark'] ?? '',
+                'remark' => $storeInfo['remark'] ?? '',
             ];
+            $orderData['parent_order_no'] = $orderData['order_no'];
             $existed = OrderService::getOne(['order_no' => $orderData['order_no']]);
             if (!$existed) {
                 //创建订单及订单商品
@@ -207,7 +217,9 @@ class OrderService
                     ]];
                     $orderData = [
                         'user_id' => $demand->user_id,
+                        'saas_id' => self::DEFAULT_SAAS_ID,
                         'store_id' => 1,
+                        'store_name' => '',
                         'parent_order_no' => $demand->parent_order_no,
                         'order_no' => generate_order_sn(),
                         'order_status' => OrderService::ORDER_STATUS_WAIT_PAY,