diff --git a/sdk/client.go b/sdk/client.go
index e61aedc1f0cbb8467231264de8209e8c17a61185..dca55a89726d5b1176cefa41a808118149546212 100644
--- a/sdk/client.go
+++ b/sdk/client.go
@@ -2,12 +2,15 @@ package sdk
 
 import (
 	"crypto/md5"
+	"encoding/hex"
 	"fmt"
 	"io/ioutil"
+	"math/rand"
 	"net/http"
 	"net/url"
-	"sort"
+	"strconv"
 	"strings"
+	"time"
 )
 
 const (
@@ -99,27 +102,21 @@ func (c *Client) Request(apiUrl string, params map[string]string, method string)
 }
 
 func (c *Client) makeSign(params map[string]string) (string, map[string]string) {
-	var keys []string
-	var data string
-	if _, ok := params["appKey"]; !ok {
-		params["appKey"] = c.appKey
-	}
+	rand.Seed(time.Now().UnixNano())
+	timer := strconv.Itoa(int(time.Now().UnixMilli()))
+	nonce := strconv.Itoa(rand.Intn(900000) + 100000)
+	signRan := fmt.Sprintf("appKey=%s&timer=%s&nonce=%s&key=%s", c.appKey, timer, nonce, c.appSecret)
+	hash := md5.New()
+	hash.Write([]byte(signRan))
+	md5Hash := hash.Sum(nil)
+	md5HashString := hex.EncodeToString(md5Hash)
+	signRan = strings.ToUpper(md5HashString)
+	params["appKey"] = c.appKey
+	params["nonce"] = nonce
+	params["signRan"] = signRan
+	params["timer"] = timer
 	if _, ok := params["version"]; !ok {
 		params["version"] = c.version
 	}
-	for key, _ := range params {
-		keys = append(keys, key)
-	}
-	sort.Strings(keys)
-	//拼接
-	for _, k := range keys {
-		data = fmt.Sprintf("%s%s=%s&", data, k, params[k])
-	}
-	data = fmt.Sprintf("%skey=%s", data, c.appSecret)
-	data = strings.Trim(data, "&")
-	m := md5.New()
-	m.Write([]byte(data))
-	sign := strings.ToUpper(fmt.Sprintf("%x", m.Sum(nil)))
-	params["sign"] = sign
-	return sign, params
+	return signRan, params
 }