diff --git a/obs/api/app/controllers/api/storage.py b/obs/api/app/controllers/api/storage.py
index b43b96b..0337645 100644
--- a/obs/api/app/controllers/api/storage.py
+++ b/obs/api/app/controllers/api/storage.py
@@ -316,6 +316,7 @@ def post(self, bucket_name):
                 bucket_name=bucket_name,
                 local_path=filename,
                 object_name=object_name,
+                content_type=file.content_type,
             )
             os.remove(filename)
 
diff --git a/obs/libs/bucket.py b/obs/libs/bucket.py
index dfa07d0..b360ade 100644
--- a/obs/libs/bucket.py
+++ b/obs/libs/bucket.py
@@ -123,7 +123,9 @@ def upload_object(**kwargs):
 
     resource = kwargs.get("resource")
     bucket_name = kwargs.get("bucket_name")
-    resource.Object(bucket_name, filename).upload_file(Filename=local_path)
+    resource.Object(bucket_name, filename).upload_file(
+        Filename=local_path, ExtraArgs={"ContentType": kwargs.get("content_type")}
+    )
 
 
 def copy_object(resource, src_bucket, src_object_name, dest_bucket, dest_object_name):
diff --git a/tests/api/test_api_storage.py b/tests/api/test_api_storage.py
index 9546154..f78fbc6 100644
--- a/tests/api/test_api_storage.py
+++ b/tests/api/test_api_storage.py
@@ -19,7 +19,7 @@ def fake_resource(access_key, secret_key):
         "ResponseMetaData": {"RequestId": "e12"}
     }
     resouce.Object.return_value.download_file.side_effect = lambda: ""
-    resouce.Object.return_value.upload_file.side_effect = lambda Filename: ""
+    resouce.Object.return_value.upload_file.side_effect = lambda Filename, ExtraArgs: ""
     resouce.Object.return_value.copy.side_effect = lambda source: ""
     return resouce