diff --git a/core.go b/core.go
index 869ce6b..1f8119c 100644
--- a/core.go
+++ b/core.go
@@ -3,6 +3,7 @@ package time_arrow
 import (
 	"errors"
 	"fmt"
+	"github.com/google/uuid"
 	"log"
 	"sort"
 	"strings"
@@ -23,7 +24,7 @@ type DateSlice struct {
 }
 
 type TimeArrow struct {
-	TimeArrowId int           `json:"time_arrow_id"`
+	TimeArrowId string        `json:"time_arrow_id"`
 	Group       string        `json:"group"`
 	Type        TimeArrowType `json:"type"`
 	//可选
@@ -165,9 +166,15 @@ func isInExpandTags(ta TimeArrow, expandTag string) bool {
 	return false
 }
 
+func createUUID() string {
+	uid := uuid.Must(uuid.NewUUID())
+	return uid.String()
+}
+
 //CreateDayOfWeekTypePlan 创建一个每周计划
 func CreateDayOfWeekTypePlan(group string, dayOfWeek []int, timesOnDay []string, expandValue interface{}, expandTags []string, weights float64) TimeArrow {
 	return TimeArrow{
+		TimeArrowId: createUUID(),
 		Type:        TimeArrowTypeDayOfWeek,
 		Group:       group,
 		DayOfWeek:   dayOfWeek,
@@ -181,6 +188,7 @@ func CreateDayOfWeekTypePlan(group string, dayOfWeek []int, timesOnDay []string,
 //CreateDayOfMonthTypePlan 创建一个每月计划
 func CreateDayOfMonthTypePlan(group string, dayOfMonth []int, timesOnDay []string, expandValue interface{}, expandTags []string, weights float64) TimeArrow {
 	return TimeArrow{
+		TimeArrowId: createUUID(),
 		Type:        TimeArrowTypeDayOfMonth,
 		Group:       group,
 		DayOfMonth:  dayOfMonth,
@@ -194,6 +202,7 @@ func CreateDayOfMonthTypePlan(group string, dayOfMonth []int, timesOnDay []strin
 //CreateDateSliceTypePlan 创建一个时间段计划
 func CreateDateSliceTypePlan(group string, dateSlice []DateSlice, timesOnDay []string, expandValue interface{}, expandTags []string, weights float64) TimeArrow {
 	return TimeArrow{
+		TimeArrowId: createUUID(),
 		Type:        TimeArrowTypeDateSlice,
 		Group:       group,
 		DateSlice:   dateSlice,