diff --git a/lib/alibaba_cloud_kit/oss/object.ex b/lib/alibaba_cloud_kit/oss/object.ex
index 5e62233..4d3b8cf 100644
--- a/lib/alibaba_cloud_kit/oss/object.ex
+++ b/lib/alibaba_cloud_kit/oss/object.ex
@@ -80,9 +80,9 @@ defmodule AlibabaCloudKit.OSS.Object do
 
       %{
         policy: policy,
-        "x-oss-signature-version": x_oss_signature_version,
         "x-oss-credential": x_oss_credential,
         "x-oss-date": x_oss_date,
+        "x-oss-signature-version": x_oss_signature_version,
         "x-oss-signature": x_oss_signature,
       } = AlibabaCloudKit.OSS.presign_post_object(conditions, seconds_to_expire, opts)
 
diff --git a/lib/alibaba_cloud_kit/signature/oss4.ex b/lib/alibaba_cloud_kit/signature/oss4.ex
index d494027..bc5fe9a 100644
--- a/lib/alibaba_cloud_kit/signature/oss4.ex
+++ b/lib/alibaba_cloud_kit/signature/oss4.ex
@@ -144,9 +144,7 @@ defmodule AlibabaCloudKit.Signature.OSS4 do
         host: "example-bucket.oss-us-west-1.aliyuncs.com",
         port: 443,
         path: "/example-object",
-        headers: [
-          {"x-oss-expires", "900"}
-        ]
+        query: "x-oss-expires=900"
       )
 
       opts = [