diff --git a/backend/services/log.go b/backend/services/log.go
index a0ba0311..a83926f2 100644
--- a/backend/services/log.go
+++ b/backend/services/log.go
@@ -34,13 +34,17 @@ func GetLocalLog(logPath string) (fileBytes []byte, err error) {
 		return nil, err
 	}
 	defer f.Close()
-	logBuf := make([]byte, 2048)
+
+	const bufLen = 2048
+	logBuf := make([]byte, bufLen)
+
 	off := int64(0)
 	if fi.Size() > int64(len(logBuf)) {
 		off = fi.Size() - int64(len(logBuf))
 	}
 	n, err := f.ReadAt(logBuf, off)
-	// 到文件结尾会有EOF的报错
+
+	//到文件结尾会有EOF标识
 	if err != nil && err.Error() != "EOF" {
 		log.Error(err.Error())
 		debug.PrintStack()
diff --git a/backend/services/log_test.go b/backend/services/log_test.go
index 0a52747c..a0b049c5 100644
--- a/backend/services/log_test.go
+++ b/backend/services/log_test.go
@@ -2,9 +2,11 @@ package services
 
 import (
 	"crawlab/config"
+	"fmt"
 	"github.com/apex/log"
 	. "github.com/smartystreets/goconvey/convey"
 	"github.com/spf13/viper"
+	"os"
 	"testing"
 )
 
@@ -20,3 +22,29 @@ func TestDeleteLogPeriodically(t *testing.T) {
 		DeleteLogPeriodically()
 	})
 }
+
+func TestGetLocalLog(t *testing.T) {
+	//create a log file for test
+	logPath := "../logs/crawlab/test.log"
+	f, err := os.Create(logPath)
+	defer f.Close()
+	if err != nil {
+		fmt.Println(err.Error())
+
+	} else {
+		_, err = f.Write([]byte("This is for test"))
+	}
+
+	Convey("Test GetLocalLog", t, func() {
+		Convey("Test response", func() {
+			logStr, err := GetLocalLog(logPath)
+			log.Info(string(logStr))
+			fmt.Println(err)
+			So(err, ShouldEqual, nil)
+
+		})
+	})
+	//delete the test log file
+	os.Remove(logPath)
+
+}