diff --git a/yuthon_hr_attendance/models/yuthon_vacation_reports.py b/yuthon_hr_attendance/models/yuthon_vacation_reports.py
index 1fff773d6..59ee720af 100644
--- a/yuthon_hr_attendance/models/yuthon_vacation_reports.py
+++ b/yuthon_hr_attendance/models/yuthon_vacation_reports.py
@@ -437,8 +437,9 @@ class YuthonVacationReports(models.Model):
                         total_add += line_total
                     elif line.update_type == 'reduce':
                         total_reduce += line_total
+                        total_add -= line_total
                         done_working_overtime += line_total
-            record.working_overtime = total_add / 8
+            record.working_overtime = max(total_add / 8, 0)
             record.done_working_overtime = done_working_overtime / 8
             record.cop_leave = total_reduce / 8