diff --git a/sf_manufacturing/models/stock.py b/sf_manufacturing/models/stock.py
index 27ce925a..76c51cff 100644
--- a/sf_manufacturing/models/stock.py
+++ b/sf_manufacturing/models/stock.py
@@ -440,7 +440,7 @@ class ProductionLot(models.Model):
         if product.tracking == "serial":
             last_serial = self.env['stock.lot'].search(
                 [('company_id', '=', company.id), ('product_id', '=', product.id)],
-                limit=1, order='id DESC')
+                limit=1, order='name desc')
             if last_serial:
                 if product.categ_id.name == '刀具':
                     return self.env['stock.lot'].get_tool_generate_lot_names1(company, product)