diff --git a/crontab.go b/crontab.go
index 7d7a424..164a776 100644
--- a/crontab.go
+++ b/crontab.go
@@ -9,6 +9,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/satori/go.uuid"
+
 	"474420502.top/eson/structure/circular_linked"
 	"github.com/Pallinder/go-randomdata"
 
@@ -42,6 +44,7 @@ func (force *Force) NextTime() time.Time {
 type Crontab struct {
 	crontab string
 
+	uid   uuid.UUID
 	force *Force
 
 	min   []timePointer
@@ -166,6 +169,12 @@ func (cron *Crontab) String() string {
 func (cron *Crontab) FromString(crontab string) error {
 	crontab = cron.crontab
 
+	uid, err := uuid.NewV4()
+	if err != nil {
+		panic(err)
+	}
+	cron.uid = uid
+
 	cron.interval = nil
 	cron.min = nil
 	cron.hour = nil
@@ -295,7 +304,7 @@ func (cron *Crontab) intervalCalculateNextTime(now time.Time) {
 
 		}
 
-		log.Println("success:", cron.trueCount, "count time wait:", isecond, "s")
+		fmt.Println(cron.uid.String(), "success:", cron.trueCount, " wait:", isecond)
 
 	} else {
 
@@ -313,7 +322,7 @@ func (cron *Crontab) intervalCalculateNextTime(now time.Time) {
 			}
 		}
 
-		log.Println("fail:", cron.failCount, "count time wait:", isecond, "s")
+		fmt.Println(cron.uid.String(), "fail:", cron.failCount, " wait:", isecond)
 	}
 
 	iv.Count--