diff --git a/code/rest/task_service.go b/code/rest/task_service.go
index 84480c4..2b87e5e 100644
--- a/code/rest/task_service.go
+++ b/code/rest/task_service.go
@@ -31,7 +31,8 @@ func (this *TaskService) Init() {
 //init the clean footprint task.
 func (this *TaskService) InitCleanFootprintTask() {
 
-	expression := "0 10 0 * * ?"
+	//use standard cron expression. 5 fields. ()
+	expression := "10 0 * * *"
 	cronJob := cron.New()
 	entryId, err := cronJob.AddFunc(expression, this.footprintService.CleanOldData)
 	core.PanicError(err)
@@ -43,7 +44,7 @@ func (this *TaskService) InitCleanFootprintTask() {
 //init the elt task.
 func (this *TaskService) InitEtlTask() {
 
-	expression := "0 5 0 * * ?"
+	expression := "5 0 * * *"
 	cronJob := cron.New()
 	entryId, err := cronJob.AddFunc(expression, this.dashboardService.Etl)
 	core.PanicError(err)
@@ -55,7 +56,7 @@ func (this *TaskService) InitEtlTask() {
 //init the scan task.
 func (this *TaskService) InitScanTask() {
 
-	expression := "0 5 0 * * ?"
+	expression := "15 0 * * *"
 	cronJob := cron.New()
 	entryId, err := cronJob.AddFunc(expression, this.dashboardService.Etl)
 	core.PanicError(err)
diff --git a/code/support/tank_logger.go b/code/support/tank_logger.go
index 166303d..c5c4fbd 100644
--- a/code/support/tank_logger.go
+++ b/code/support/tank_logger.go
@@ -25,7 +25,7 @@ func (this *TankLogger) Init() {
 
 	this.openFile()
 
-	expression := "0 0 0 * * ?"
+	expression := "0 0 * * *"
 	cronJob := cron.New()
 	entryId, err := cronJob.AddFunc(expression, this.maintain)
 	core.PanicError(err)
diff --git a/code/test/cron_test.go b/code/test/cron_test.go
index dc5c665..fc56aef 100644
--- a/code/test/cron_test.go
+++ b/code/test/cron_test.go
@@ -1,13 +1,53 @@
 package test
 
 import (
+	"fmt"
+	"github.com/eyebluecn/tank/code/core"
 	"github.com/robfig/cron/v3"
+	"log"
 	"testing"
+	"time"
 )
 
+func TestEveryOneSecondCron(t *testing.T) {
+
+	i := 0
+	customMethod := true
+
+	var c *cron.Cron
+	var spec string
+	if customMethod {
+		//use custom cron. every 1 second.
+		c = cron.New(cron.WithSeconds())
+		spec = "*/1 * * * * ?"
+	} else {
+		c = cron.New()
+		spec = "@every 1s"
+	}
+
+	entryId, err := c.AddFunc(spec, func() {
+		i++
+		log.Println("cron running:", i)
+		if i == 5 {
+			return
+		}
+	})
+	fmt.Printf("entryId = %d\n", entryId)
+	core.PanicError(err)
+
+	c.Start()
+
+	time.Sleep(3500 * time.Millisecond)
+	if i != 3 {
+		t.Errorf("should be 3\n")
+	}
+	fmt.Printf("i = %d", i)
+
+}
+
 func TestValidateCron(t *testing.T) {
 
-	spec := "*/1 * * * * ?"
+	spec := "@every 1s"
 	_, err := cron.ParseStandard(spec)
 	if err != nil {
 		t.Error(err)
diff --git a/code/test/main_test.go b/code/test/main_test.go
index dd97827..3945af9 100644
--- a/code/test/main_test.go
+++ b/code/test/main_test.go
@@ -2,10 +2,7 @@ package test
 
 import (
 	"fmt"
-	"github.com/eyebluecn/tank/code/core"
 	"github.com/eyebluecn/tank/code/tool/util"
-	"github.com/robfig/cron/v3"
-	"log"
 	"strings"
 	"testing"
 	"time"
@@ -23,27 +20,6 @@ func TestHello(t *testing.T) {
 
 }
 
-func TestCron(t *testing.T) {
-
-	i := 0
-	c := cron.New()
-	spec := "*/1 * * * * ?"
-	entryId, err := c.AddFunc(spec, func() {
-		i++
-		log.Println("cron running:", i)
-		if i == 3 {
-			panic("intent to panic.")
-		}
-	})
-	fmt.Printf("entryId = %d", entryId)
-	core.PanicError(err)
-
-	c.Start()
-
-	time.Sleep(3 * time.Second)
-
-}
-
 func TestDayAgo(t *testing.T) {
 
 	dayAgo := time.Now()