diff --git a/server/controllers/down.go b/server/controllers/down.go
index 3f2ac7fb..c6601497 100644
--- a/server/controllers/down.go
+++ b/server/controllers/down.go
@@ -3,6 +3,7 @@ package controllers
 import (
 	"github.com/Xhofe/alist/alidrive"
 	"github.com/Xhofe/alist/server/models"
+	"github.com/Xhofe/alist/utils"
 	"github.com/gin-gonic/gin"
 	log "github.com/sirupsen/logrus"
 	"path/filepath"
@@ -31,7 +32,7 @@ func Down(c *gin.Context) {
 		c.JSON(200, MetaResponse(500, err.Error()))
 		return
 	}
-	if fileModel.Password != "" && fileModel.Password != down.Password {
+	if fileModel.Password != "" && fileModel.Password != utils.Get16MD5Encode(down.Password) {
 		if down.Password == "" {
 			c.JSON(200, MetaResponse(401, "need password."))
 		} else {
diff --git a/test/string_test.go b/test/string_test.go
index e28a0842..bd5a533a 100644
--- a/test/string_test.go
+++ b/test/string_test.go
@@ -2,6 +2,7 @@ package test
 
 import (
 	"fmt"
+	"github.com/Xhofe/alist/utils"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -24,4 +25,8 @@ func TestPassword(t *testing.T) {
 func TestDir(t *testing.T) {
 	dir,file:=filepath.Split("root")
 	fmt.Printf("dir:%s\nfile:%s\n",dir,file)
+}
+
+func TestMD5(t *testing.T) {
+	fmt.Printf("%s\n", utils.Get16MD5Encode("123456"))
 }
\ No newline at end of file
diff --git a/utils/md5.go b/utils/md5.go
new file mode 100644
index 00000000..32b5d37c
--- /dev/null
+++ b/utils/md5.go
@@ -0,0 +1,18 @@
+package utils
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+)
+
+//返回一个32位md5加密后的字符串
+func GetMD5Encode(data string) string {
+	h := md5.New()
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+//返回一个16位md5加密后的字符串
+func Get16MD5Encode(data string) string{
+	return GetMD5Encode(data)[8:24]
+}