diff --git a/pkg/serverconfigs/metric_item_config.go b/pkg/serverconfigs/metric_item_config.go
index 6f7e8cc..ba62cc9 100644
--- a/pkg/serverconfigs/metric_item_config.go
+++ b/pkg/serverconfigs/metric_item_config.go
@@ -156,7 +156,7 @@ func (this *MetricItemConfig) ServerExpiresDay() string {
 		if this.ExpiresPeriod > 0 {
 			return timeutil.FormatTime("Ymd", time.Now().Unix()-86400*int64(this.ExpiresPeriod))
 		} else {
-			return timeutil.FormatTime("Ymd", time.Now().Unix()-86400*int64(this.Period*32))
+			return timeutil.FormatTime("Ymd", time.Now().Unix()-86400*int64(this.Period*8))
 		}
 	case MetricItemPeriodUnitHour:
 		if this.ExpiresPeriod > 0 {