diff --git a/api_v1/views/shipment/test_api.py b/api_v1/views/shipment/test_api.py
index 53df44d..8aaa4a1 100644
--- a/api_v1/views/shipment/test_api.py
+++ b/api_v1/views/shipment/test_api.py
@@ -1307,6 +1307,29 @@ class ShipmentQueryAPITestCase(TestCase):
         self.shipment1.refresh_from_db()
         self.assertEqual(getattr(self.shipment1, "area", ""), "更新地区")
 
+    def test_patch_shipment_rejects_non_draft(self):
+        """
+        非草稿状态的出货单不允许修改业务数据。
+        """
+        from shipment.services import modify_status
+
+        modify_status(
+            self.shipment1,
+            target_status=shipment_models.ShipmentStatus.PUBLISHED,
+            operator=self.user1,
+        )
+
+        resp = self.client.patch(
+            f"/api/v1/shipment/shipments/{self.shipment1.id}/",
+            data={"area": "不允许修改"},
+            format="json",
+        )
+        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertIn("仅草稿状态", resp.json()["detail"])
+
+        self.shipment1.refresh_from_db()
+        self.assertEqual(self.shipment1.area, "A1")
+
     def test_list_shipments_includes_external_finished_product_remark(self):
         """
         Shipments list 需要附带 external_finished_products 明细数据（包含 remark 字段）。
diff --git a/api_v1/views/shipment/views.py b/api_v1/views/shipment/views.py
index de79f0d..e434ea2 100644
--- a/api_v1/views/shipment/views.py
+++ b/api_v1/views/shipment/views.py
@@ -239,33 +239,20 @@ class ShipmentDetailView(RetrieveModelMixin, GenericAPIView):
             return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
         data = serializer.validated_data
 
-        # customer 变更需校验 merchant 一致
-        if "customer" in data:
-            from basic_info.models import Customer
+        from shipment.services import update_shipment
 
-            try:
-                customer = Customer.objects.get(id=data["customer"])
-            except Customer.DoesNotExist:
-                return Response(
-                    {"detail": f"客户 {data['customer']} 不存在"},
-                    status=status.HTTP_400_BAD_REQUEST,
-                )
-            if customer.merchant_id != shipment.merchant_id:
-                return Response(
-                    {"detail": "无权限绑定该客户"}, status=status.HTTP_400_BAD_REQUEST
-                )
-            shipment.customer = customer
+        try:
+            shipment = update_shipment(
+                shipment,
+                customer_id=data.get("customer"),
+                shipment_date=data.get("shipment_date"),
+                area=data.get("area"),
+                remark=data.get("remark"),
+                external_id=data.get("external_id"),
+            )
+        except ValueError as e:
+            return Response({"detail": str(e)}, status=status.HTTP_400_BAD_REQUEST)
 
-        if "shipment_date" in data:
-            shipment.shipment_date = data["shipment_date"]
-        if "area" in data:
-            shipment.area = (data.get("area") or "").strip()
-        if "remark" in data:
-            shipment.remark = data.get("remark") or ""
-        if "external_id" in data:
-            shipment.external_id = (data.get("external_id") or "").strip() or None
-
-        shipment.save()
         return Response(ShipmentSerializer(shipment).data, status=status.HTTP_200_OK)
 
     def put(self, request, pk: int):
diff --git a/docs/shipment_api.md b/docs/shipment_api.md
index 9bf7138..959bd17 100644
--- a/docs/shipment_api.md
+++ b/docs/shipment_api.md
@@ -84,6 +84,38 @@
 
 ---
 
+### 更新出货单
+
+- **URL**: `/api/v1/shipment/shipments/<id>/`
+- **Method**: `PATCH` / `PUT`
+- **认证**: 需要登录（JWT Token）
+
+说明：
+
+- 仅允许修改业务数据字段：`customer`、`shipment_date`、`area`、`remark`、`external_id`
+- 该接口不允许修改 `status`
+- 仅 `草稿(未发布)` 状态的出货单允许修改
+- 非草稿状态会返回 `400 Bad Request`
+
+请求体示例：
+
+```json
+{
+  "area": "更新地区",
+  "remark": "更新备注"
+}
+```
+
+错误示例：
+
+```json
+{
+  "detail": "仅草稿状态的出货单允许修改"
+}
+```
+
+---
+
 ## 创建出货单
 
 创建出货单并关联销售品。
diff --git a/flower/settings.py b/flower/settings.py
index 867d245..239d336 100644
--- a/flower/settings.py
+++ b/flower/settings.py
@@ -223,6 +223,7 @@ DATABASES = {
         'PORT': env('DB_PORT', default='6432'),
         'CONN_HEALTH_CHECK': True,
         'CONN_MAX_AGE': env.int('CONN_MAX_AGE', default=0),
+        'DISABLE_SERVER_SIDE_CURSORS': True,
     }
 }
 
diff --git a/shipment/services.py b/shipment/services.py
index 02bae6c..41d59a6 100644
--- a/shipment/services.py
+++ b/shipment/services.py
@@ -207,6 +207,49 @@ def modify_status(
     return shipment
 
 
+@transaction.atomic
+def update_shipment(
+    shipment: Shipment,
+    *,
+    customer_id: int | None = None,
+    shipment_date=None,
+    area: str | None = None,
+    remark: str | None = None,
+    external_id: str | None = None,
+) -> Shipment:
+    """
+    更新出货单业务数据。
+
+    说明：
+    - 仅允许在草稿状态下修改
+    - 不处理状态变更
+    """
+    from basic_info.models import Customer
+
+    if shipment.status != ShipmentStatus.DRAFT:
+        raise ValueError("仅草稿状态的出货单允许修改")
+
+    if customer_id is not None:
+        customer = Customer.objects.filter(id=customer_id).first()
+        if customer is None:
+            raise ValueError(f"客户 {customer_id} 不存在")
+        if customer.merchant_id != shipment.merchant_id:
+            raise ValueError("无权限绑定该客户")
+        shipment.customer = customer
+
+    if shipment_date is not None:
+        shipment.shipment_date = shipment_date
+    if area is not None:
+        shipment.area = (area or "").strip()
+    if remark is not None:
+        shipment.remark = remark or ""
+    if external_id is not None:
+        shipment.external_id = (external_id or "").strip() or None
+
+    shipment.save()
+    return shipment
+
+
 @transaction.atomic
 def create_shipment(
     customer_id: int,