diff --git a/yuthon_hr_attendance/models/go_approval.py b/yuthon_hr_attendance/models/go_approval.py
index 4ca4cdf70..59ec723c1 100644
--- a/yuthon_hr_attendance/models/go_approval.py
+++ b/yuthon_hr_attendance/models/go_approval.py
@@ -52,6 +52,24 @@ class GoApprovals(models.Model):
             if rec.is_day and (not rec.start_day_selection or not rec.end_day_selection):
                 raise UserError("勾选按天后，必须选择开始时段和结束时段！")
 
+    @api.constrains('start_date', 'end_date', 'employee_ids')
+    def _check_date_overlap(self):
+        for rec in self:
+            if not rec.start_date or not rec.end_date or not rec.employee_ids:
+                continue
+            for employee in rec.employee_ids:
+                # 查找同一员工其他外出申请中时间段有交叉的记录（排除自身，active=False即撤销的自动被排除）
+                overlapping = self.env['go.approval'].search([
+                    ('id', '!=', rec.id),
+                    ('employee_ids', 'in', employee.id),
+                    ('start_date', '<=', rec.end_date),
+                    ('end_date', '>=', rec.start_date),
+                ])
+                if overlapping:
+                    raise ValidationError(
+                        f"员工【{employee.name}】在 {rec.start_date} 至 {rec.end_date} 期间已有外出申请，相同时间段内不能重复创建。"
+                    )
+
     def _get_default_name_title(self):
         return self._description if self._description else self._name