diff --git a/sdks/storage/cdsapi/presigned.go b/sdks/storage/cdsapi/presigned.go
index 5e755fb..b357e71 100644
--- a/sdks/storage/cdsapi/presigned.go
+++ b/sdks/storage/cdsapi/presigned.go
@@ -33,10 +33,23 @@ type PresignedObjectDownloadByPath struct {
 	Length    *int64           `form:"length" url:"length,omitempty"`
 }
 
-func (c *PresignedService) ObjectDownload(req PresignedObjectDownloadByPath, expireIn int) (string, error) {
+func (c *PresignedService) ObjectDownloadByPath(req PresignedObjectDownloadByPath, expireIn int) (string, error) {
 	return c.presign(req, PresignedObjectDownloadByPathPath, http.MethodGet, expireIn)
 }
 
+const PresignedObjectDownloadPath = "/v1/presigned/object/download"
+
+type PresignedObjectDownload struct {
+	UserID   cdssdk.UserID   `form:"userID" url:"userID" binding:"required"`
+	ObjectID cdssdk.ObjectID `form:"objectID" url:"objectID" binding:"required"`
+	Offset   int64           `form:"offset" url:"offset,omitempty"`
+	Length   *int64          `form:"length" url:"length,omitempty"`
+}
+
+func (c *PresignedService) ObjectDownload(req PresignedObjectDownload, expireIn int) (string, error) {
+	return c.presign(req, PresignedObjectDownloadPath, http.MethodGet, expireIn)
+}
+
 const PresignedObjectUploadPath = "/v1/presigned/object/upload"
 
 type PresignedObjectUpload struct {
diff --git a/sdks/storage/cdsapi/presigned_test.go b/sdks/storage/cdsapi/presigned_test.go
index 37c5b87..f4071c9 100644
--- a/sdks/storage/cdsapi/presigned_test.go
+++ b/sdks/storage/cdsapi/presigned_test.go
@@ -16,7 +16,7 @@ func Test_Presigned(t *testing.T) {
 
 	Convey("下载文件", t, func() {
 		pre := cli.Presigned()
-		url, err := pre.ObjectDownload(PresignedObjectDownloadByPath{
+		url, err := pre.ObjectDownloadByPath(PresignedObjectDownloadByPath{
 			UserID:    1,
 			PackageID: 3,
 			Path:      "example.java",
@@ -39,14 +39,16 @@ func Test_Presigned(t *testing.T) {
 	})
 }
 
-func Test_PresignedObjectDownload(t *testing.T) {
+func Test_PresignedObjectDownloadByPath(t *testing.T) {
 	cli := NewClient(&Config{
-		URL: "http://localhost:7890",
+		URL:       "http://localhost:7890",
+		AccessKey: "123456",
+		SecretKey: "123456",
 	})
 
 	Convey("下载文件", t, func() {
 		pre := cli.Presigned()
-		url, err := pre.ObjectDownload(PresignedObjectDownloadByPath{
+		url, err := pre.ObjectDownloadByPath(PresignedObjectDownloadByPath{
 			UserID:    1,
 			PackageID: 3,
 			Path:      "example.java",
@@ -58,6 +60,26 @@ func Test_PresignedObjectDownload(t *testing.T) {
 	})
 }
 
+func Test_PresignedObjectDownload(t *testing.T) {
+	cli := NewClient(&Config{
+		URL:       "http://localhost:7890",
+		AccessKey: "123456",
+		SecretKey: "123456",
+	})
+
+	Convey("下载文件", t, func() {
+		pre := cli.Presigned()
+		url, err := pre.ObjectDownload(PresignedObjectDownload{
+			UserID:   1,
+			ObjectID: 1039,
+			// Offset:    1,
+			// Length:    types.Ref(int64(100)),
+		}, 100)
+		So(err, ShouldEqual, nil)
+		t.Logf("url: %s", url)
+	})
+}
+
 func Test_PresignedObjectUpload(t *testing.T) {
 	cli := NewClient(&Config{
 		URL: "http://localhost:7890",
@@ -94,7 +116,9 @@ func Test_PresignedNewMultipartUpload(t *testing.T) {
 
 func Test_PresignedObjectUploadPart(t *testing.T) {
 	cli := NewClient(&Config{
-		URL: "http://localhost:7890",
+		URL:       "http://localhost:7890",
+		AccessKey: "123456",
+		SecretKey: "123456",
 	})
 
 	Convey("上传分片", t, func() {
@@ -111,7 +135,9 @@ func Test_PresignedObjectUploadPart(t *testing.T) {
 
 func Test_PresignedCompleteMultipartUpload(t *testing.T) {
 	cli := NewClient(&Config{
-		URL: "http://localhost:7890",
+		URL:       "http://localhost:7890",
+		AccessKey: "123456",
+		SecretKey: "123456",
 	})
 
 	Convey("合并分片", t, func() {
diff --git a/sdks/storage/cdsapi/signer.go b/sdks/storage/cdsapi/signer.go
index d0bea77..67e39e5 100644
--- a/sdks/storage/cdsapi/signer.go
+++ b/sdks/storage/cdsapi/signer.go
@@ -95,7 +95,7 @@ func SignWithPayloadHash(req *http.Request, payloadHash string, accessKey, secre
 //
 // expiration为签名过期时间，单位为秒。
 //
-// 签名时不会包含请求体的哈希值。
+// 签名时不会包含请求体的哈希值。注：不要设置任何额外的Header（除了自动添加的Host），以免签名校验不通过
 func Presign(req *http.Request, accessKey, secretKey string, expiration int) (string, error) {
 	query := req.URL.Query()
 	query.Add("X-Expires", fmt.Sprintf("%v", expiration))