diff --git a/data_sender.go b/data_sender.go
index d6f045d..93be1f0 100644
--- a/data_sender.go
+++ b/data_sender.go
@@ -1,22 +1,22 @@
 package data_sender_go
 
 import (
-	"google.golang.org/grpc"
-	"log"
-
 	"context"
 	"encoding/json"
-	"fmt"
+	"google.golang.org/grpc"
+	"io/ioutil"
+	"loafle.com/overflow/agent_api/observer"
 	pb "loafle.com/overflow/crawler_go/grpc"
 	"loafle.com/overflow/cron_go"
 	q "loafle.com/overflow/queue_go"
+	"log"
 	"os"
 	"sync"
 )
 
 const (
 	CENTRAL_ADDR     = "127.0.0.1:50052"
-	FILE_PATH        = "/home/insanity/data/temp"
+	FILE_PATH        = "/home/insanity/data/data.tmp"
 	SENDER_ID        = "OVERFLOW_DATA_SENDER"
 	DEFAULT_INTERVAL = uint64(5)
 )
@@ -45,7 +45,7 @@ func (ds *DataSender) Stop() {
 }
 
 func (ds *DataSender) init() {
-	ds.queue = q.NewQueue(q.EVENT_TYPE, 3)
+	ds.queue = q.NewQueue(observer.DATA_QUEUE, 3)
 
 	cr := &cron.Cron{}
 	ds.runStat = cr.Start()
@@ -58,7 +58,7 @@ func (ds *DataSender) check() {
 	if len <= 0 {
 		return
 	}
-	result := make([]*Data, len)
+	result := make([]*Data, 0)
 	for _, item := range items {
 		collectedData := item.Value.(*Data)
 		collectedData.AgentId = agentIdentifier()
@@ -69,9 +69,22 @@ func (ds *DataSender) check() {
 }
 
 func (ds *DataSender) send(data []*Data) {
+
+	bytes := ds.getFailedData()
+	if bytes != nil {
+		failed := Data{}
+		err := json.Unmarshal(bytes, &failed)
+		if err != nil {
+			log.Println(err)
+		}
+		data = append([]*Data{&failed}, data...) //prepend
+		ds.removeFailed()
+	}
+
+	return
 	conn, err := grpc.Dial(CENTRAL_ADDR, grpc.WithInsecure())
 	if err != nil {
-		saveFailedData(data)
+		ds.saveFailedData(data)
 		return
 	}
 	defer conn.Close()
@@ -80,13 +93,29 @@ func (ds *DataSender) send(data []*Data) {
 	client := pb.NewStatusClient(conn)
 	out, err := client.Status(context.Background(), &pb.Empty{})
 	if err != nil {
-		saveFailedData(data)
+		ds.saveFailedData(data)
 		return
 	}
 	log.Print(out)
 }
 
-func saveFailedData(datas []*Data) {
+func (ds *DataSender) getFailedData() []byte {
+	b, err := ioutil.ReadFile(FILE_PATH)
+	if err != nil {
+		log.Println(err)
+		return nil
+	}
+	return b
+}
+
+func (ds *DataSender) removeFailed() {
+	err := os.Remove(FILE_PATH)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func (ds *DataSender) saveFailedData(datas []*Data) {
 
 	file, err := tempFile()
 	if err != nil {
@@ -100,13 +129,12 @@ func saveFailedData(datas []*Data) {
 	}()
 
 	for _, data := range datas {
-
 		bytes, err := json.Marshal(&data)
 		if err != nil {
 			log.Println(err)
 		}
 		if bytes != nil {
-			fmt.Println("write : ", string(bytes))
+			log.Println("write : ", string(bytes))
 			_, err = file.Write(bytes)
 			if err != nil {
 				log.Println(err)
diff --git a/data_sender_test.go b/data_sender_test.go
index 0f6b941..ad8ddf1 100644
--- a/data_sender_test.go
+++ b/data_sender_test.go
@@ -3,7 +3,6 @@ package data_sender_go
 import (
 	"fmt"
 	"loafle.com/overflow/agent_api/observer"
-	"loafle.com/overflow/queue_go"
 	"testing"
 	"time"
 )
@@ -35,5 +34,5 @@ func testNotify() {
 	}
 
 	fmt.Println("New data Notify")
-	observer.Notify(queue.StringType(queue.EVENT_TYPE), cd)
+	observer.Notify(observer.DATA_QUEUE.String(), cd)
 }