diff --git a/plugin_manager/timer/sleep.go b/plugin_manager/timer/sleep.go
index 961cb362..ddcc51a0 100644
--- a/plugin_manager/timer/sleep.go
+++ b/plugin_manager/timer/sleep.go
@@ -22,22 +22,22 @@ func (ts *Timer) nextWakeTime() (date time.Time) {
 	h := ts.Hour()
 	mn := ts.Minute()
 	w := ts.Week()
-	unit := time.Duration(ts.Minute()-date.Minute()) * time.Minute
+	var unit time.Duration
 	logrus.Debugln("[timer] unit init:", unit)
 	if mn >= 0 {
 		switch {
 		case h < 0:
 			if unit <= time.Second {
-				unit += time.Hour
+				unit = time.Hour
 			}
 		case d < 0 || w < 0:
 			if unit <= time.Second {
-				unit += time.Hour * 24
+				unit = time.Hour * 24
 			}
 		case d == 0 && w >= 0:
 			delta := time.Hour * 24 * time.Duration(int(w)-int(date.Weekday()))
 			if delta < 0 {
-				delta += time.Hour * 24 * 7
+				delta = time.Hour * 24 * 7
 			}
 			unit += delta
 		case m < 0:
diff --git a/plugin_manager/timer/timer_test.go b/plugin_manager/timer/timer_test.go
index 94b8b572..015982cd 100644
--- a/plugin_manager/timer/timer_test.go
+++ b/plugin_manager/timer/timer_test.go
@@ -9,9 +9,11 @@ import (
 
 func TestNextWakeTime(t *testing.T) {
 	logrus.SetLevel(logrus.DebugLevel)
-	ts := &Timer{
-		En1Month4Day5Week3Hour5Min6: 0xffffff,
-	}
+	ts := &Timer{}
+	ts.SetMonth(-1)
+	ts.SetWeek(6)
+	ts.SetHour(16)
+	ts.SetMinute(30)
 	t1 := time.Until(ts.nextWakeTime())
 	if t1 < 0 {
 		t.Log(t1)