diff --git a/crontab.go b/crontab.go
index 32ad39e..3111c3b 100644
--- a/crontab.go
+++ b/crontab.go
@@ -9,9 +9,27 @@ import (
 	"strings"
 	"time"
 
+	"github.com/Pallinder/go-randomdata"
+
 	"github.com/davecgh/go-spew/spew"
 )
 
+type randLR struct {
+	left, right int
+}
+
+type hInterval struct {
+	PlanFail   []randLR
+	PlanNormal []randLR
+
+	Count      int
+	ConstCount int
+}
+
+func (interval *hInterval) reset() {
+	interval.Count = interval.ConstCount
+}
+
 type timePointer struct {
 	left, right           int
 	leftlimit, rightlimit int
@@ -35,6 +53,10 @@ type Crontab struct {
 	SkipPlans []time.Time
 
 	YearPlan *trieYear
+
+	interval   *CircularLinked
+	lastStatus bool
+	nextTime   time.Time
 }
 
 // NewCrontab create 一个crontab
@@ -44,6 +66,31 @@ func NewCrontab(crontab string) *Crontab {
 	return cron
 }
 
+// SetStatus 设置状态 接口定义
+func (cron *Crontab) SetStatus(status interface{}) {
+	if cron.interval != nil {
+		cron.lastStatus = status.(bool)
+	}
+}
+
+// GetStatus 设置状态 接口定义
+func (cron *Crontab) GetStatus() (status interface{}) {
+	if cron.interval != nil {
+		return cron.lastStatus
+	}
+	return nil
+}
+
+// TimeUp 是否时间快到
+func (cron *Crontab) TimeUp() bool {
+
+	if cron.interval != nil {
+		return cron.intervalTimeUp()
+	}
+
+	return cron.linuxTimeUp()
+}
+
 func (cron *Crontab) String() string {
 	return fmt.Sprintf("min:%s\nhour:%s\nday:%s\nmonth:%s\nweek:%s\n", spew.Sdump(cron.min), spew.Sdump(cron.hour), spew.Sdump(cron.day), spew.Sdump(cron.month), spew.Sdump(cron.week))
 }
@@ -56,6 +103,13 @@ func (cron *Crontab) FromString(crontab string) error {
 	mlen := len(matches)
 	switch mlen {
 	case 1:
+		// "f1-2|5-10x5,f1|10m,10-15,f1"
+		cron.nextTime = time.Now()
+		cron.lastStatus = true
+		cron.interval = NewCircularLinked()
+		var intervalList []interface{}
+		intervalList = parseIntervalString(matches[0])
+		cron.interval.Append(intervalList...)
 
 	case 5:
 		cron.min = createTimePointer(matches[0], 0, 59, true)
@@ -64,7 +118,7 @@ func (cron *Crontab) FromString(crontab string) error {
 		cron.month = createTimePointer(matches[3], 1, 12, true)
 		cron.week = createTimePointer(matches[4], 0, 6, true)
 
-		cron.CreateYearPlan()
+		cron.createYearPlan()
 	default:
 		return errors.New("mathches len != want, check crontab string")
 	}
@@ -72,15 +126,13 @@ func (cron *Crontab) FromString(crontab string) error {
 	return nil
 }
 
-// CreateYearPlan 创建年度计划
-func (cron *Crontab) CreateYearPlan() {
+// createYearPlan 创建年度计划
+func (cron *Crontab) createYearPlan() {
 	cron.YearPlan = newTrieYear()
 	cron.YearPlan.FromCrontab(cron)
 }
 
-// TimeUp 是否时间快到
-func (cron *Crontab) TimeUp() bool {
-
+func (cron *Crontab) linuxTimeUp() bool {
 	now := time.Now()
 	maxlen := 1000
 	createlen := 500
@@ -94,7 +146,7 @@ func (cron *Crontab) TimeUp() bool {
 			lastplan = cron.WillPlans[plen-1].Add(time.Minute)
 		}
 		if !cron.YearPlan.CheckYear() {
-			cron.CreateYearPlan()
+			cron.createYearPlan()
 		}
 
 		timeplans := cron.YearPlan.GetPlanTime(cron, lastplan, uint(maxlen-plen))
@@ -130,6 +182,36 @@ func (cron *Crontab) TimeUp() bool {
 	return false
 }
 
+func (cron *Crontab) intervalTimeUp() bool {
+
+	now := time.Now()
+	if now.Unix() >= cron.nextTime.Unix() {
+
+		iv := cron.interval.Cursor().GetValue().(hInterval)
+		isecond := 0
+		if cron.lastStatus == false && len(iv.PlanFail) > 0 {
+			idx := randomdata.Number(len(iv.PlanFail))
+			lr := iv.PlanFail[idx]
+			isecond = randomdata.Number(lr.left, lr.right+1)
+		} else {
+			idx := randomdata.Number(len(iv.PlanNormal))
+			lr := iv.PlanNormal[idx]
+			isecond = randomdata.Number(lr.left, lr.right+1)
+		}
+
+		iv.Count--
+		if iv.Count <= 0 {
+			iv.reset()
+			cron.interval.MoveNext()
+		}
+
+		cron.nextTime = now.Add(time.Duration(isecond) * time.Second)
+		return true
+	}
+
+	return false
+}
+
 func createTimePointer(min string, llimit, rlimit int, fixedLeftRight bool) []timePointer {
 
 	var result []timePointer
@@ -217,3 +299,98 @@ func createTimePointer(min string, llimit, rlimit int, fixedLeftRight bool) []ti
 
 	return result
 }
+
+func parseIntervalString(crontab string) []interface{} {
+	var result []interface{}
+
+	values := strings.Split(crontab, ",")
+	for _, value := range values {
+		interval := hInterval{}
+		// 次数
+		valuesCounts := strings.Split(value, "x")
+		switch len(valuesCounts) {
+		case 1:
+			interval.ConstCount = 1
+
+		case 2:
+			count, err := strconv.Atoi(valuesCounts[1])
+			if err != nil {
+				panic(err)
+			}
+			interval.ConstCount = count
+		default:
+			panic("valuesCounts error, the len is not in range")
+		}
+
+		// 统计失败与普通间隔值的数组
+		failAndNormal := valuesCounts[0]
+
+		valuesFN := strings.Split(failAndNormal, "|")
+
+		for _, FN := range valuesFN {
+			if FN == "" {
+				continue
+			}
+
+			switch FN[0] {
+			case 'f', 'F':
+				fvalue := FN[1:]
+				interval.PlanFail = append(interval.PlanFail, parseRandLR(fvalue))
+			case 'n':
+				value := FN[1:]
+				interval.PlanNormal = append(interval.PlanNormal, parseRandLR(value))
+			default:
+				interval.PlanNormal = append(interval.PlanNormal, parseRandLR(FN))
+			}
+		}
+
+		interval.reset()
+		result = append(result, interval)
+	}
+
+	return result
+}
+
+func parseRandLR(value string) randLR {
+	vlen := len(value)
+	lastchar := value[vlen-1]
+
+	lr := strings.Split(value, "-")
+	switch len(lr) {
+	case 1:
+		lr := randLR{parseTimeValue(lr[0], lastchar), parseTimeValue(lr[0], lastchar)}
+		return lr
+	case 2:
+
+		lr := randLR{parseTimeValue(lr[0], lastchar), parseTimeValue(lr[1], lastchar)}
+		return lr
+	default:
+		panic("lr is error")
+	}
+}
+
+func getInt(v string) int {
+	vint, err := strconv.Atoi(v)
+	if err != nil {
+		panic(err)
+	}
+	return vint
+}
+
+func parseTimeValue(v string, lastchar byte) int {
+
+	vlen := len(v)
+
+	switch lastchar {
+	case 's':
+		return getInt(v[:vlen-1])
+	case 'm':
+		return getInt(v[:vlen-1]) * 60
+	case 'h':
+		return getInt(v[:vlen-1]) * 3600
+	case 'd':
+		return getInt(v[:vlen-1]) * 3600 * 24
+	default:
+		return getInt(v)
+	}
+}
diff --git a/crontab_test.go b/crontab_test.go
index 59ca0da..a9368c6 100644
--- a/crontab_test.go
+++ b/crontab_test.go
@@ -25,7 +25,7 @@ func TestParseCrontab(t *testing.T) {
 		t.Error("GetPlanTime error len != 10")
 	}
 
-	cron.CreateYearPlan()
+	cron.createYearPlan()
 	if !cron.TimeUp() {
 		t.Error("timeup error")
 	}
@@ -34,6 +34,26 @@ func TestParseCrontab(t *testing.T) {
 
 }
 
+func TestParseInterval(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
+	// t.Error("")
+	// crontab := "f1-2|1-3|5-8x5,f1|10m,10-15,f1"
+
+	// PrintMemUsage()
+	// cron := NewCrontab(crontab)
+
+	// now := time.Now()
+	// for i := 0; i <= 15; i++ {
+	// 	if cron.TimeUp() {
+	// 		log.Println(time.Since(now))
+	// 		now = time.Now()
+	// 	}
+	// 	time.Sleep(time.Second)
+	// }
+
+	// PrintMemUsage()
+}
+
 func TestCrontabPlus(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 * * * *")
diff --git a/structure.go b/structure.go
index 180bcc1..8415f0a 100644
--- a/structure.go
+++ b/structure.go
@@ -1,6 +1,12 @@
 package curl2info
 
-import "container/heap"
+import (
+	"container/heap"
+	"log"
+	"strings"
+
+	"github.com/davecgh/go-spew/spew"
+)
 
 // trieWord Trie 需要的Word接口
 type trieWord interface {
@@ -242,3 +248,234 @@ func (pqe *pQueueExecute) Len() int {
 // 	}
 // 	return content
 // }
+
+// CNode 循环链表 三色标记 不确定是否会清除循环引用, 网上说会
+type CNode struct {
+	value interface{}
+	prev  *CNode
+	next  *CNode
+}
+
+// GetValue 获取到Node的值
+func (node *CNode) GetValue() interface{} {
+	return node.value
+}
+
+// SetValue 获取到Node的值
+func (node *CNode) SetValue(value interface{}) {
+	node.value = value
+}
+
+// CircularLinked 循环链表
+type CircularLinked struct {
+	cursor *CNode
+	head   *CNode
+	tail   *CNode
+	size   uint64
+}
+
+// NewCircularLinked create a CircularLinked
+func NewCircularLinked(values ...interface{}) *CircularLinked {
+	list := &CircularLinked{}
+	if len(values) > 0 {
+		list.Append(values...)
+	}
+	return list
+}
+
+// Cursor get current Cursor
+func (list *CircularLinked) Cursor() *CNode {
+	if list.cursor == nil {
+		list.cursor = list.head
+	}
+	return list.cursor
+}
+
+// MoveNext get next Cursor
+func (list *CircularLinked) MoveNext() *CNode {
+	if list.cursor == nil {
+		list.cursor = list.head
+	}
+	list.cursor = list.cursor.next
+	return list.cursor
+}
+
+// MovePrev get prev Cursor
+func (list *CircularLinked) MovePrev() *CNode {
+	if list.cursor == nil {
+		list.cursor = list.head
+	}
+	list.cursor = list.cursor.prev
+	return list.cursor
+}
+
+// CursorToHead cursor move to head
+func (list *CircularLinked) CursorToHead() *CNode {
+	list.cursor = list.head
+	return list.cursor
+}
+
+// CursorToTail cursor move to tail
+func (list *CircularLinked) CursorToTail() *CNode {
+	list.cursor = list.tail
+	return list.cursor
+}
+
+// GetLoopValues 获取从头到尾的值
+func (list *CircularLinked) GetLoopValues() []*CNode {
+	var result []*CNode
+
+	if list.head != nil {
+		result = append(result, list.head)
+		for cur := list.head.next; cur != list.head; cur = cur.next {
+			result = append(result, cur)
+		}
+	}
+	return result
+}
+
+// Append a value (one or more) at the end of the list (same as Append())
+func (list *CircularLinked) Append(values ...interface{}) {
+	for _, value := range values {
+		node := &CNode{value: value}
+		if list.size == 0 {
+			list.head = node
+			list.tail = node
+			node.next = node
+			node.prev = node
+		} else {
+			list.tail.next = node
+			node.next = list.head
+			node.prev = list.tail
+			list.tail = node
+		}
+		list.size++
+	}
+}
+
+// Remove 移除一些节点
+func (list *CircularLinked) Remove(node *CNode) {
+
+	switch list.size {
+	case 0:
+		list.errorNotInList(node)
+	case 1:
+		if list.head == node {
+			list.head = nil
+			list.tail = nil
+			node.next = nil
+			node.prev = nil
+			list.cursor = nil
+			list.size--
+		} else {
+			list.errorNotInList(node)
+		}
+	case 2:
+
+		node.prev = nil
+		node.next = nil
+
+		switch node {
+		case list.head:
+			list.head = list.tail
+			list.tail.prev = list.head
+			list.head.next = list.tail
+			list.cursor = list.head
+			list.size--
+		case list.tail:
+			list.tail = list.head
+			list.tail.prev = list.head
+			list.head.next = list.tail
+			list.cursor = list.head
+			list.size--
+		default:
+			list.errorNotInList(node)
+		}
+
+	default:
+		switch node {
+		case list.head:
+			_, next := list.cutAndSplice(node)
+			list.size--
+			list.head = next
+			if list.cursor == node {
+				list.cursor = next
+			}
+		case list.tail:
+			prev, _ := list.cutAndSplice(node)
+			list.size--
+			list.tail = prev
+			if list.cursor == node {
+				list.cursor = prev
+			}
+		default:
+			_, next := list.cutAndSplice(node)
+			list.size--
+			if list.cursor == node {
+				list.cursor = next
+			}
+		}
+	}
+
+}
+
+// LookCursor for list show
+func (list *CircularLinked) LookCursor() string {
+	cursor := list.Cursor()
+
+	content := "->["
+	cur := list.head
+	if list.size != 0 {
+		for size := uint64(0); size < list.size; size++ {
+			if cursor == cur {
+				content += "(" + spew.Sprint(cur.value) + ")" + ", "
+			} else {
+				content += spew.Sprint(cur.value) + ", "
+			}
+
+			cur = cur.next
+		}
+	}
+	content = strings.TrimRight(content, ", ")
+	showlen := len(content)
+	if showlen >= 64 {
+		showlen = 64
+	}
+	content += "]" + content[0:showlen] + " ..."
+	return content
+}
+
+// Clear for list show
+func (list *CircularLinked) Clear() {
+	if list.size != 0 {
+		list.head.prev = nil
+		list.tail.next = nil
+		list.head = nil
+		list.tail = nil
+		list.cursor = nil
+		list.size = 0
+	}
+}
+
+// Size for list show
+func (list *CircularLinked) Size() uint64 {
+	return list.size
+}
+
+func (list *CircularLinked) errorNotInList(node *CNode) {
+	log.Println("the node value ", spew.Sprint(node), " is not in list")
+}
+
+// cutAndSplice 不考虑边界情况 上层使用的是否判断
+func (list *CircularLinked) cutAndSplice(node *CNode) (prev, next *CNode) {
+	prev = node.prev
+	next = node.next
+
+	prev.next = next
+	next.prev = prev
+
+	node.prev = nil
+	node.next = nil
+
+	return prev, next
+}