diff --git a/sell/models/sell_order.py b/sell/models/sell_order.py
index bff3ec6a4..2e055bb58 100644
--- a/sell/models/sell_order.py
+++ b/sell/models/sell_order.py
@@ -80,6 +80,12 @@ def _compute_delivery(self):
             order.delivery_count = len([deli for deli in order.delivery_ids if not deli.is_return])
             order.return_count = len([deli for deli in order.delivery_ids if deli.is_return])
 
+    @api.one
+    @api.depends('line_ids.goods_id', 'line_ids.quantity')
+    def _compute_net_weight(self):
+        '''计算净重合计'''
+        self.net_weight = sum(line.goods_id.net_weight * line.quantity for line in self.line_ids)
+
     partner_id = fields.Many2one('partner', u'客户',
                                  ondelete='restrict', states=READONLY_STATES,
                                  help=u'签约合同的客户')
@@ -194,6 +200,8 @@ def _compute_delivery(self):
         readonly=True,
         copy=False,
         help=u'输入预收款确认时产生的预收款单')
+    net_weight = fields.Float(
+        string=u'净重合计', compute='_compute_net_weight', store=True)
 
     @api.onchange('address_id')
     def onchange_partner_address(self):
diff --git a/sell/tests/test_sell_order.py b/sell/tests/test_sell_order.py
index 1408b9325..aaa7752f8 100644
--- a/sell/tests/test_sell_order.py
+++ b/sell/tests/test_sell_order.py
@@ -225,6 +225,12 @@ def test_sell_order_done_no_attribute(self):
         with self.assertRaises(UserError):
             self.order.sell_order_done()
 
+    def test_compute_net_weight(self):
+        '''计算净重合计'''
+        self.env.ref('goods.mouse').net_weight = 50
+        self.order.line_ids[0].quantity = 10
+        self.assertEqual(self.order.net_weight, 50 * 10)
+
 
 class TestSellOrderLine(TransactionCase):