diff --git a/yuthon_hr_employee/models/yuthon_hr_department.py b/yuthon_hr_employee/models/yuthon_hr_department.py
index 2a08054fe..1d3890d19 100644
--- a/yuthon_hr_employee/models/yuthon_hr_department.py
+++ b/yuthon_hr_employee/models/yuthon_hr_department.py
@@ -18,11 +18,21 @@ class YuthonHrDepartment(models.Model):
     expiration_date = fields.Date(string="失效日期", default=fields.Date.today())
     end_date = fields.Date(string="结束时间")
     department_code = fields.Char(string="部门序号", store=True)
+    lower_ids = fields.One2many('hr.department', 'parent_id', string="下级部门")
 
     @api.onchange('department_code', 'parent_id')
     def _onchange_department_code(self):
         for code in self:
             if code.parent_id.department_code:
-                code.department_code = code.parent_id.department_code + code.department_code if code.department_code else ''
+                code.department_code = code.parent_id.department_code +  ('.' + code.department_code.split('.')[-1] if code.department_code else '')
             else:
-                code.department_code = code.department_code
\ No newline at end of file
+                code.department_code = code.department_code
+            code.update_code()
+    def update_code(self):
+        def cycle_code(parent,parent_code):
+             for child in parent.lower_ids:
+                new_code = parent_code +('.' + child.department_code.split('.')[-1] if child.department_code else '')
+                self.env['hr.department'].search([('id', '=', child.id.origin)]).write({'department_code': new_code})
+                cycle_code(child,new_code)
+
+        cycle_code(self, self.department_code)
\ No newline at end of file