diff --git a/yuthon_hr_attendance/models/overtime_approval.py b/yuthon_hr_attendance/models/overtime_approval.py
index 617f446af..54618c563 100644
--- a/yuthon_hr_attendance/models/overtime_approval.py
+++ b/yuthon_hr_attendance/models/overtime_approval.py
@@ -122,7 +122,9 @@ class OvertimeApprovals(models.Model):
                 rel_end_time = rec.attendance_id.shift_id.end_datetime + timedelta(hours=8)
             else:
                 rel_end_time = rec.start_time.replace(hour=18, minute=0, second=0, microsecond=0)
+
             end_time = rec.end_time + timedelta(hours=8)
+            rel_end_time = max(rel_end_time, rec.start_time + timedelta(hours=8))
             # 只有工作日18点开始算加班
             if rec.type_overtime == 'work':
                 total_seconds = (end_time - rel_end_time).total_seconds()