diff --git a/config/dev-example.toml b/config/dev-example.toml
index 58c638c..a02d7c0 100644
--- a/config/dev-example.toml
+++ b/config/dev-example.toml
@@ -23,6 +23,10 @@ level = "debug"
 sender = "xxxxx"
 secret = "xxxxx"
 
+[cos]
+secret_id="xxx"
+secret_key="xxx"
+
 [oauth.server]
 # urlExample := "postgres://username:password@localhost:5432/database_name"
 db_uri = "xxxx"
@@ -37,7 +41,3 @@ redirect_url = "xxx"
 id = "xxx"
 secret = "xxx"
 redirect_url = "xxx"
-
-[cos]
-secret_id="xxx"
-secret_key="xxx"
\ No newline at end of file
diff --git a/model/user_test.go b/model/user_test.go
index 89dc52b..274eb8e 100644
--- a/model/user_test.go
+++ b/model/user_test.go
@@ -11,10 +11,11 @@ func TestGenerateCode(t *testing.T) {
 }
 
 func TestSendEmail(t *testing.T) {
-	testEmail := "xunop@qq.com"
+	testEmail := "user@example.org"
 	code := GenerateVerifyCode()
-	title := "发送邮件测试"
-	SendEmail(testEmail, code, title)
+	title := "发送邮件测试，请勿回复"
+	content := InsertCode(code)
+	SendEmail(testEmail, content, title)
 }
 
 func TestVerifyCode(t *testing.T) {
diff --git a/util/common.go b/util/common.go
index b5796dd..2a86f4b 100644
--- a/util/common.go
+++ b/util/common.go
@@ -7,8 +7,6 @@ import (
 	"encoding/base64"
 	"encoding/hex"
 	"fmt"
-	"github.com/NJUPT-SAST/sast-link-backend/config"
-	"github.com/tencentyun/cos-go-sdk-v5"
 	mr "math/rand"
 	"net"
 	"net/http"
@@ -18,6 +16,9 @@ import (
 	"os"
 	"time"
 
+	"github.com/NJUPT-SAST/sast-link-backend/config"
+	"github.com/tencentyun/cos-go-sdk-v5"
+
 	"github.com/google/uuid"
 )
 
@@ -25,6 +26,10 @@ var (
 	T_cos *cos.Client = connectToTencentCOS()
 )
 
+const (
+	larkSmtpServer = "smtp.feishu.cn:465"
+)
+
 func connectToTencentCOS() *cos.Client {
 	// 将 examplebucket-1250000000 和 COS_REGION 修改为用户真实的信息
 	// 存储桶名称，由 bucketname-appid 组成，appid 必须填入，可以在 COS 控制台查看存储桶名称。https://console.cloud.tencent.com/cos5/bucket
@@ -103,7 +108,7 @@ func GenerateCode() string {
 }
 
 // sendEmail send email to user
-func SendEmail(sender string, secret string, recipient string, content, title string) error {
+func SendEmail(sender, secret, recipient, content, title string) error {
 	// https://gist.github.com/chrisgillis/10888032
 	from := mail.Address{"", sender}
 	to := mail.Address{"", recipient}
@@ -121,10 +126,11 @@ func SendEmail(sender string, secret string, recipient string, content, title st
 	for k, v := range headers {
 		message += fmt.Sprintf("%s: %s\r\n", k, v)
 	}
-	message += "\r\n" + body
+	header := "Content-Type: text/html; charset=\"UTF-8\";\n\n"
+	message += header + "\r\n" + body
 
 	// Connect to the SMTP server
-	servername := "smtp.feishu.cn:465"
+	servername := larkSmtpServer
 
 	host, _, _ := net.SplitHostPort(servername)