diff --git a/api_v1/views/shipment/serializers.py b/api_v1/views/shipment/serializers.py
index 292be57..ef3b826 100644
--- a/api_v1/views/shipment/serializers.py
+++ b/api_v1/views/shipment/serializers.py
@@ -27,7 +27,7 @@ class ShipmentSerializer(serializers.ModelSerializer):
         model = Shipment
         fields = [
             'id', 'merchant_id', 'merchant_name',
-            'customer', 'customer_name', 'shipment_date', 'remark',
+            'customer', 'customer_name', 'shipment_date', 'area', 'remark',
             'status', 'status_display',
             'external_id',
             'cancelled_at', 'cancelled_by_id', 'cancelled_by_name',
@@ -114,6 +114,7 @@ class ShipmentCreateNormalSerializer(serializers.Serializer):
     """
     customer = serializers.IntegerField(help_text='客户ID')
     shipment_date = serializers.DateField(help_text='出货日期')
+    area = serializers.CharField(max_length=30, required=False, default='', allow_blank=True, help_text='出货地区（可选）')
     remark = serializers.CharField(required=False, default='', allow_blank=True, help_text='备注')
     sales_items = serializers.ListField(
         child=serializers.IntegerField(),
@@ -144,6 +145,7 @@ class ShipmentCreateExternalSerializer(serializers.Serializer):
     """
     customer = serializers.IntegerField(help_text='客户ID')
     shipment_date = serializers.DateField(help_text='出货日期')
+    area = serializers.CharField(max_length=30, required=False, default='', allow_blank=True, help_text='出货地区（可选）')
     remark = serializers.CharField(required=False, default='', allow_blank=True, help_text='备注')
     external_id = serializers.CharField(max_length=120, help_text='外部订单号（必填）')
     external_finished_products = serializers.ListField(
@@ -164,6 +166,19 @@ class ShipmentCreateExternalSerializer(serializers.Serializer):
         return value
 
 
+class ShipmentUpdateSerializer(serializers.Serializer):
+    """
+    出货单更新序列化器（PATCH/PUT）
+
+    说明：本次新增字段 area，需要保证更新入口可写入并回显。
+    """
+    customer = serializers.IntegerField(required=False, help_text='客户ID（可选）')
+    shipment_date = serializers.DateField(required=False, help_text='出货日期（可选）')
+    area = serializers.CharField(max_length=30, required=False, allow_blank=True, help_text='出货地区（可选）')
+    remark = serializers.CharField(required=False, allow_blank=True, help_text='备注（可选）')
+    external_id = serializers.CharField(max_length=120, required=False, allow_blank=True, allow_null=True, help_text='外部订单号（可选）')
+
+
 class SalesItemSerializer(serializers.Serializer):
     """
     销售品序列化器（只读）
diff --git a/api_v1/views/shipment/test_api.py b/api_v1/views/shipment/test_api.py
index 836eb44..f4977c5 100644
--- a/api_v1/views/shipment/test_api.py
+++ b/api_v1/views/shipment/test_api.py
@@ -348,6 +348,7 @@ class ShipmentCreateAPITestCase(TestCase):
         data = {
             'customer': self.customer.id,
             'shipment_date': '2026-01-14',
+            'area': '华东',
             'remark': '测试备注',
             'sales_items': [self.sales_item1.id, self.sales_item2.id]
         }
@@ -362,6 +363,7 @@ class ShipmentCreateAPITestCase(TestCase):
         self.assertEqual(result['customer'], self.customer.id)
         self.assertEqual(result['customer_name'], self.customer.name)
         self.assertEqual(result['shipment_date'], '2026-01-14')
+        self.assertEqual(result.get('area', ''), '华东')
         self.assertEqual(result['remark'], '测试备注')
         self.assertEqual(result['items_count'], 2)
         self.assertEqual(result['created_by_id'], self.user.id)
@@ -488,6 +490,7 @@ class ShipmentExternalCreateAPITestCase(TestCase):
         data = {
             'customer': self.customer.id,
             'shipment_date': '2026-01-14',
+            'area': '华南',
             'remark': 'external 备注',
             'external_id': 'EXT-ORDER-001',
             'external_finished_products': [
@@ -502,6 +505,7 @@ class ShipmentExternalCreateAPITestCase(TestCase):
 
         self.assertEqual(result['customer'], self.customer.id)
         self.assertEqual(result['external_id'], 'EXT-ORDER-001')
+        self.assertEqual(result.get('area', ''), '华南')
         self.assertEqual(result['items_count'], 0)
         self.assertEqual(result['external_finished_products_count'], 2)
 
@@ -618,6 +622,7 @@ class ShipmentQueryAPITestCase(TestCase):
             shipment_date='2026-01-15',
             created_by=self.user1,
             remark='s1',
+            area='A1',
         )
         self.shipment2 = shipment_models.Shipment.objects.create(
             merchant=self.merchant2,
@@ -625,6 +630,7 @@ class ShipmentQueryAPITestCase(TestCase):
             shipment_date='2026-01-15',
             created_by=self.user2,
             remark='s2',
+            area='B1',
         )
 
         self.client.force_authenticate(user=self.user1)
@@ -643,6 +649,8 @@ class ShipmentQueryAPITestCase(TestCase):
 
         # 关键：列表序列化器必须稳定输出明细数组字段（即使为空）
         item = next(it for it in data['results'] if it['id'] == self.shipment1.id)
+        self.assertIn('area', item)
+        self.assertEqual(item['area'], 'A1')
         self.assertIn('sales_items', item)
         self.assertIsInstance(item['sales_items'], list)
         self.assertIn('external_finished_products', item)
@@ -653,11 +661,30 @@ class ShipmentQueryAPITestCase(TestCase):
         self.assertEqual(resp.status_code, status.HTTP_200_OK)
         result = resp.json()
         self.assertEqual(result['id'], self.shipment1.id)
+        self.assertIn('area', result)
+        self.assertEqual(result['area'], 'A1')
         self.assertIn('sales_items', result)
         self.assertIsInstance(result['sales_items'], list)
         self.assertIn('external_finished_products', result)
         self.assertIsInstance(result['external_finished_products'], list)
 
+    def test_patch_shipment_area_success(self):
+        """
+        新增字段 area：支持更新（PATCH）并回显。
+        """
+        resp = self.client.patch(
+            f'/api/v1/shipment/shipments/{self.shipment1.id}/',
+            data={'area': '更新地区'},
+            format='json'
+        )
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        result = resp.json()
+        self.assertEqual(result['id'], self.shipment1.id)
+        self.assertEqual(result.get('area', ''), '更新地区')
+
+        self.shipment1.refresh_from_db()
+        self.assertEqual(getattr(self.shipment1, 'area', ''), '更新地区')
+
     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 669b151..d1b386d 100644
--- a/api_v1/views/shipment/views.py
+++ b/api_v1/views/shipment/views.py
@@ -16,6 +16,7 @@ from .serializers import (
     ShipmentSerializer,
     ShipmentCreateNormalSerializer,
     ShipmentCreateExternalSerializer,
+    ShipmentUpdateSerializer,
 )
 
 
@@ -122,6 +123,7 @@ class ShipmentListCreateView(ListModelMixin, GenericAPIView):
                 sales_item_ids=data['sales_items'],
                 created_by=request.user,
                 remark=data.get('remark', ''),
+                area=data.get('area', ''),
             )
         except ValueError as e:
             return Response({'detail': str(e)}, status=status.HTTP_400_BAD_REQUEST)
@@ -161,6 +163,47 @@ class ShipmentDetailView(RetrieveModelMixin, GenericAPIView):
     def get(self, request, pk: int):
         return self.retrieve(request, pk=pk)
 
+    def patch(self, request, pk: int):
+        """
+        更新出货单（部分更新）
+        PATCH /api/v1/shipment/shipments/<id>/
+        """
+        shipment = self.get_object()
+        serializer = ShipmentUpdateSerializer(data=request.data, partial=True)
+        if not serializer.is_valid():
+            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
+            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
+
+        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):
+        """
+        更新出货单（全量更新，当前实现允许缺省字段，等同于 PATCH）
+        PUT /api/v1/shipment/shipments/<id>/
+        """
+        return self.patch(request, pk=pk)
+
 
 class ShipmentExternalCreateView(APIView):
     """
@@ -191,6 +234,7 @@ class ShipmentExternalCreateView(APIView):
                 external_finished_products=data['external_finished_products'],
                 created_by=request.user,
                 remark=data.get('remark', ''),
+                area=data.get('area', ''),
             )
         except ValueError as e:
             return Response({'detail': str(e)}, status=status.HTTP_400_BAD_REQUEST)
diff --git a/docs/shipment_api.md b/docs/shipment_api.md
index 8595cb0..a9b3696 100644
--- a/docs/shipment_api.md
+++ b/docs/shipment_api.md
@@ -84,6 +84,7 @@
 |------|------|------|------|
 | customer | int | 是 | 客户ID |
 | shipment_date | string | 是 | 出货日期（YYYY-MM-DD） |
+| area | string | 否 | 出货地区（可空字符串，长度<=30） |
 | remark | string | 否 | 备注 |
 | sales_items | array[int] | 否 | 要关联的销售品ID列表 |
 
@@ -93,6 +94,7 @@
 {
     "customer": 1,
     "shipment_date": "2026-01-14",
+    "area": "华东",
     "remark": "备注信息",
     "sales_items": [1, 2, 3]
 }
@@ -108,6 +110,7 @@
     "customer": 1,
     "customer_name": "客户A",
     "shipment_date": "2026-01-14",
+    "area": "华东",
     "remark": "备注信息",
     "items_count": 3,
     "sales_items": [],
@@ -129,6 +132,7 @@
 | customer | int | 客户ID |
 | customer_name | string | 客户名称 |
 | shipment_date | string | 出货日期 |
+| area | string | 出货地区 |
 | remark | string | 备注 |
 | items_count | int | 关联的销售品数量 |
 | created_by_id | int | 创建人ID |
@@ -180,6 +184,7 @@
 |------|------|------|------|
 | customer | int | 是 | 客户ID |
 | shipment_date | string | 是 | 出货日期（YYYY-MM-DD） |
+| area | string | 否 | 出货地区（可空字符串，长度<=30） |
 | remark | string | 否 | 备注 |
 | external_id | string | 是 | 外部订单号（长度<=120） |
 | external_finished_products | array[object] | 是 | 外部成品表结构数组（至少 1 条） |
@@ -198,6 +203,7 @@
 {
   "customer": 1,
   "shipment_date": "2026-01-14",
+  "area": "华南",
   "remark": "external 备注（可选）",
   "external_id": "EXT-ORDER-001",
   "external_finished_products": [
@@ -217,6 +223,7 @@
   "customer": 1,
   "customer_name": "客户A",
   "shipment_date": "2026-01-14",
+  "area": "华南",
   "remark": "external 备注（可选）",
   "status": 1,
   "status_display": "待送货",
diff --git a/shipment/migrations/0008_add_area_to_shipment.py b/shipment/migrations/0008_add_area_to_shipment.py
new file mode 100644
index 0000000..88c7ca8
--- /dev/null
+++ b/shipment/migrations/0008_add_area_to_shipment.py
@@ -0,0 +1,17 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('shipment', '0007_add_remark_to_external_finished_product'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='shipment',
+            name='area',
+            field=models.CharField(blank=True, default='', help_text='出货地区（可空字符串）', max_length=30, verbose_name='地区'),
+        ),
+    ]
+
diff --git a/shipment/models.py b/shipment/models.py
index 73099e7..fcc2256 100644
--- a/shipment/models.py
+++ b/shipment/models.py
@@ -127,6 +127,14 @@ class Shipment(ModelBase):
         verbose_name='出货日期',
         help_text='实际出货日期'
     )
+
+    area = models.CharField(
+        max_length=30,
+        blank=True,
+        default='',
+        verbose_name='地区',
+        help_text='出货地区（可空字符串）',
+    )
     
     remark = models.TextField(
         blank=True,
diff --git a/shipment/services.py b/shipment/services.py
index 596e0fd..c595ea2 100644
--- a/shipment/services.py
+++ b/shipment/services.py
@@ -49,6 +49,7 @@ def create_shipment(
     sales_item_ids: List[int],
     created_by,
     remark: str = '',
+    area: str = '',
 ) -> Shipment:
     """
     创建出货单并关联销售品
@@ -104,6 +105,7 @@ def create_shipment(
         merchant=merchant,
         customer=customer,
         shipment_date=shipment_date,
+        area=(area or '').strip(),
         remark=remark,
         created_by=created_by,
     )
@@ -125,6 +127,7 @@ def create_external_shipment(
     external_finished_products: List[dict],
     created_by,
     remark: str = '',
+    area: str = '',
 ) -> Shipment:
     """
     创建出货单（external 版），并批量写入外部成品表并关联到出货单。
@@ -160,6 +163,7 @@ def create_external_shipment(
         merchant=merchant,
         customer=customer,
         shipment_date=shipment_date,
+        area=(area or '').strip(),
         remark=remark,
         created_by=created_by,
         external_id=external_id,