diff --git a/crontab.go b/crontab.go
index c8c04c0..1fe63c6 100644
--- a/crontab.go
+++ b/crontab.go
@@ -23,9 +23,6 @@ type hInterval struct {
 	PlanFail []randLR
 	PlanTrue []randLR
 
-	TrueCount int
-	FailCount int
-
 	Count      int
 	ConstCount int
 }
@@ -61,7 +58,10 @@ type Crontab struct {
 	interval     *clinked.CircularLinked
 	lastStatus   bool
 	isCalculated bool
-	nextTime     time.Time
+
+	trueCount int
+	failCount int
+	nextTime  time.Time
 }
 
 // NewCrontab create 一个crontab
@@ -222,34 +222,19 @@ func (cron *Crontab) linuxTimeUp() bool {
 
 // IntervalCalculateNextTime  计算时间间隔的下次时间
 func (cron *Crontab) intervalCalculateNextTime(now time.Time) {
-	iv := cron.interval.Cursor().GetValue().(hInterval)
+	iv := cron.interval.Cursor().GetValue().(*hInterval)
 	isecond := 0
 
-	if cron.lastStatus {
-		iv.TrueCount++
-		iv.FailCount = 0
-	} else {
-		iv.FailCount++
-		iv.TrueCount = 0
+	if iv.PlanFailCount.Size() == 0 && len(iv.PlanFail) == 0 {
+		cron.lastStatus = true
 	}
 
-	if cron.lastStatus == false {
+	if cron.lastStatus {
 
-		isecond = intervalPriorityListISecond(&iv.PlanFailCount, iv.FailCount)
-		if isecond == -1 {
-			if len(iv.PlanFail) > 0 {
-				idx := randomdata.Number(len(iv.PlanFail))
-				lr := iv.PlanFail[idx]
-				isecond = randomdata.Number(lr.left, lr.right+1)
-			} else {
-				isecond = 0
-			}
-		}
+		cron.trueCount++
+		cron.failCount = 0
 
-		log.Println("fail:", iv.FailCount, "count time wait:", isecond, "s")
-	} else {
-
-		isecond = intervalPriorityListISecond(&iv.PlanTrueCount, iv.TrueCount)
+		isecond = intervalPriorityListISecond(&iv.PlanTrueCount, cron.trueCount)
 		if isecond == -1 {
 			if len(iv.PlanTrue) > 0 {
 				idx := randomdata.Number(len(iv.PlanTrue))
@@ -261,8 +246,26 @@ func (cron *Crontab) intervalCalculateNextTime(now time.Time) {
 			}
 
 		} else {
-			log.Println("success:", iv.TrueCount, "count time wait:", isecond, "s")
+			log.Println("success:", cron.trueCount, "count time wait:", isecond, "s")
 		}
+
+	} else {
+
+		cron.failCount++
+		cron.trueCount = 0
+
+		isecond = intervalPriorityListISecond(&iv.PlanFailCount, cron.failCount)
+		if isecond == -1 {
+			if len(iv.PlanFail) > 0 {
+				idx := randomdata.Number(len(iv.PlanFail))
+				lr := iv.PlanFail[idx]
+				isecond = randomdata.Number(lr.left, lr.right+1)
+			} else {
+				isecond = 0
+			}
+		}
+
+		log.Println("fail:", cron.failCount, "count time wait:", isecond, "s")
 	}
 
 	iv.Count--
@@ -381,7 +384,8 @@ func parseIntervalString(crontab string) []interface{} {
 
 	values := strings.Split(crontab, ",")
 	for _, value := range values {
-		interval := hInterval{}
+		interval := &hInterval{}
+
 		// 次数
 		valuesCounts := strings.Split(value, "x")
 		switch len(valuesCounts) {
diff --git a/crontab_test.go b/crontab_test.go
index 4b87401..190d1d7 100644
--- a/crontab_test.go
+++ b/crontab_test.go
@@ -59,6 +59,13 @@ func TestParseInterval(t *testing.T) {
 	}
 }
 
+func isInRangeTime(sec, t float64) error {
+	if sec >= t-0.05 && sec <= t+0.05 {
+		return nil
+	}
+	return fmt.Errorf("计算错误 范围 %f-%f interval time is %f", t-0.05, t+0.05, sec)
+}
+
 func TestParseIntervalPlus(t *testing.T) {
 	// crontab := "0-5/2,7-30/3,30,35,40-^1 * * * *" //(秒) 分 时 号(每月的多少号, 要注意月可可能性)  星期几(每个星期的) /每 ,列表 -范围
 	// crondata := NewCrontab("*22 * * * *")
@@ -66,51 +73,62 @@ func TestParseIntervalPlus(t *testing.T) {
 	//crontab := "0-5/2,7-30/3,30,35,40-^1 * * * *" //(秒) 分 时 号(每月的多少号, 要注意月可可能性)  星期几(每个星期的) /每 ,列表 -范围
 	//crontab := "f1-2|1-3|5-8x5,f1|10m,10-15,f1" ^代表往后算 ^5 2月份就代表 28-4=24 f代表失败后1-2秒设置 由SetStatus控制 t 相反默认不写前缀为t
 
-	crontab := "f2|f2?3|f3?4|1"
+	log.SetFlags(log.Llongfile)
+
+	crontab := "f2|f2?3|f3?4|1|t4?5"
 	cron := NewCrontab(crontab)
+
+	i := 0
 	now := time.Now()
-	t.Error("")
-	for i := 0; i <= 5*15; i++ {
-		cron.NextTime()
+	lasttime := now
+
+	for j := 0; j <= 2500; j++ {
+
+		nexttime := cron.NextTime()
+		if j >= 5 && !nexttime.Equal(lasttime) {
+			lasttime = nexttime
+		}
+
 		if cron.TimeUp() {
 			sec := time.Since(now).Seconds()
-			cron.SetStatus(false)
-			t.Error(i, sec)
-			if i == 0 {
-				if 1.0 <= sec && sec <= 1.1 {
-					t.Log(sec)
-				} else {
-					t.Error(i, "interval time is ", sec)
+
+			switch i {
+			case 0:
+
+			case 1:
+				if err := isInRangeTime(sec, 2.0); err != nil {
+					t.Error(err.Error(), "status = ", cron.GetStatus())
+				}
+			case 2:
+				if err := isInRangeTime(sec, 3.0); err != nil {
+					t.Error(err.Error(), "status = ", cron.GetStatus())
+				}
+			case 3:
+				if err := isInRangeTime(sec, 4.0); err != nil {
+					t.Error(err.Error(), "status = ", cron.GetStatus())
+				}
+			case 5:
+				if err := isInRangeTime(sec, 1); err != nil {
+					t.Error(err.Error(), "status = ", cron.GetStatus())
+				}
+			default:
+				if i >= 10 {
+					if err := isInRangeTime(sec, 5.0); err != nil {
+						t.Error(err.Error(), "status = ", cron.GetStatus())
+					}
 				}
 			}
-
-			if i == 1 {
-				if 2.0 <= sec && sec <= 2.1 {
-					t.Log(sec)
-				} else {
-					t.Error(i, "interval time is ", sec)
-				}
-			}
-
-			if i == 2 {
-				if 3.0 <= sec && sec <= 3.1 {
-					t.Log(sec)
-				} else {
-					t.Error(i, "interval time is ", sec)
-				}
-			}
-
-			if i == 3 {
-				if 4.0 <= sec && sec <= 4.1 {
-					t.Log(sec)
-				} else {
-					t.Error(i, "interval time is ", sec)
-				}
+			if i <= 3 {
+				cron.SetStatus(false)
+			} else {
+				cron.SetStatus(true)
 			}
 
 			now = time.Now()
+			i++
 		}
-		time.Sleep(time.Millisecond * 200)
+
+		time.Sleep(time.Millisecond * 10)
 	}
 }