diff --git a/README.md b/README.md
index f59b0c9..ea397b8 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,7 @@
 
 Cronlib is easy golang crontab library, support parse crontab and schedule cron jobs.
 
-**tks**
-
-cron_parser.go import https://github.com/robfig/cron/blob/master/parser.go , thank @robfig
+cron_parser.go import `https://github.com/robfig/cron/blob/master/parser.go`, thank @robfig
 
 ## Feature
 
@@ -18,45 +16,75 @@ cron_parser.go import https://github.com/robfig/cron/blob/master/parser.go , tha
 
 ## Usage
 
+see more [example](github.com/rfyiamcool/example)
+
 ### quick run
 
 ```go
-func run() error {
-	cron := cronlib.New()
+package main
 
-	specList := map[string]string{
-		"risk.scan.total.1s":       "*/1 * * * * *",
-		"risk.scan.total.2s":       "*/2 * * * * *",
-		"risk.scan.total.3s":       "*/3 * * * * *",
-		"risk.scan.total.4s":       "*/4 * * * * *",
-		"risk.scan.total.5s.to.3s": "*/5 * * * * *",
-	}
+import (
+	"log"
 
-	for srv, spec := range specList {
-		tspec := spec // copy
-		ssrv := srv   // copy
+	"github.com/rfyiamcool/cronlib"
+)
 
-		// create job
-		job, err := cronlib.NewJobModel(
-			spec,
-			func() {
-				stdout(ssrv, tspec)
-			},
-		)
-		if err != nil {
-			panic(err.Error())
-		}
+var (
+	cron = cronlib.New()
+)
 
-		// register srvName -> job
-		err = cron.Register(srv, job)
-		if err != nil {
-			panic(err.Error())
-		}
-	}
+func main() {
+	handleClean()
+	go start()
 
+	// cron already start, dynamic add job
+	handleBackup()
+
+	select {}
+}
+
+func start() {
 	cron.Start()
 	cron.Wait()
 }
+
+func handleClean() {
+	job, err := cronlib.NewJobModel(
+		"*/5 * * * * *",
+		func() {
+			pstdout("do clean gc action")
+		},
+	)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	err = cron.Register("clean", job)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func handleBackup() {
+	job, err := cronlib.NewJobModel(
+		"*/5 * * * * *",
+		func() {
+			pstdout("do backup action")
+		},
+	)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	err = cron.DynamicRegister("backup", job)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func pstdout(srv string) {
+	log.Println(srv)
+}
 ```
 
 ### set job attr
diff --git a/example/easy/easy.go b/example/easy/easy.go
new file mode 100644
index 0000000..075eb95
--- /dev/null
+++ b/example/easy/easy.go
@@ -0,0 +1,64 @@
+package main
+
+import (
+	"log"
+
+	"github.com/rfyiamcool/cronlib"
+)
+
+var (
+	cron = cronlib.New()
+)
+
+func main() {
+	handleClean()
+	go start()
+
+	// dynamic add
+	handleBackup()
+
+	select {}
+}
+
+func start() {
+	cron.Start()
+	cron.Wait()
+}
+
+func handleClean() {
+	job, err := cronlib.NewJobModel(
+		"*/5 * * * * *",
+		func() {
+			pstdout("do clean gc action")
+		},
+	)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	err = cron.Register("clean", job)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func handleBackup() {
+	job, err := cronlib.NewJobModel(
+		"*/5 * * * * *",
+		func() {
+			pstdout("do backup action")
+		},
+	)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	err = cron.DynamicRegister("backup", job)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func pstdout(srv string) {
+	log.Println(srv)
+}
diff --git a/example/run.go b/example/hard/hard.go
similarity index 100%
rename from example/run.go
rename to example/hard/hard.go
diff --git a/example/simple.go b/example/multi/multi.go
similarity index 87%
rename from example/simple.go
rename to example/multi/multi.go
index 2597516..3a4e21b 100644
--- a/example/simple.go
+++ b/example/multi/multi.go
@@ -11,8 +11,8 @@ func main() {
 	cron := cronlib.New()
 
 	specList := map[string]string{
-		"risk.scan.total.per.5s": "*/5 * * * * *",
-		"risk.scan.total.min.0s": "0 * * * * *",
+		"risk.scan.total.per.5s":  "*/5 * * * * *",
+		"risk.scan.total.min.0s":  "0 * * * * *",
 		"risk.scan.total.per.30s": "*/30 * * * * *",
 	}
 
diff --git a/example/parse_next_time.go b/example/parse_time/parse_next_time.go
similarity index 100%
rename from example/parse_next_time.go
rename to example/parse_time/parse_next_time.go
diff --git a/scheduler.go b/scheduler.go
index a2ad9d0..7b977a7 100644
--- a/scheduler.go
+++ b/scheduler.go
@@ -75,6 +75,11 @@ func (c *CronSchduler) UpdateJobModel(srv string, model *JobModel) error {
 	return c.reset(srv, model, false, true)
 }
 
+// DynamicRegister - after cronlib already run, dynamic add a job, the job autostart by cronlib.
+func (c *CronSchduler) DynamicRegister(srv string, model *JobModel) error {
+	return c.reset(srv, model, false, true)
+}
+
 // reset - reset srv model
 func (c *CronSchduler) reset(srv string, model *JobModel, denyReplace, autoStart bool) error {
 	c.Lock()