diff --git a/modelscope/hub/api.py b/modelscope/hub/api.py
index a0d97712..999f1336 100644
--- a/modelscope/hub/api.py
+++ b/modelscope/hub/api.py
@@ -563,7 +563,7 @@ class HubApi:
             if revision is None:
                 revision = MASTER_MODEL_BRANCH
                 logger.info(
-                    'Model revision not specified, use default: %s in development mode'
+                    'Model revision not specified, using default: [%s] version.'
                     % revision)
             if revision not in all_branches and revision not in all_tags:
                 raise NotExistError('The model: %s has no revision : %s .' % (model_id, revision))
diff --git a/modelscope/hub/constants.py b/modelscope/hub/constants.py
index b3d03e1a..b4878b38 100644
--- a/modelscope/hub/constants.py
+++ b/modelscope/hub/constants.py
@@ -9,7 +9,7 @@ DEFAULT_MODELSCOPE_DATA_ENDPOINT = MODELSCOPE_URL_SCHEME + DEFAULT_MODELSCOPE_DO
 MODELSCOPE_PARALLEL_DOWNLOAD_THRESHOLD_MB = int(
     os.environ.get('MODELSCOPE_PARALLEL_DOWNLOAD_THRESHOLD_MB', 500))
 MODELSCOPE_DOWNLOAD_PARALLELS = int(
-    os.environ.get('MODELSCOPE_DOWNLOAD_PARALLELS', 4))
+    os.environ.get('MODELSCOPE_DOWNLOAD_PARALLELS', 1))
 DEFAULT_MODELSCOPE_GROUP = 'damo'
 MODEL_ID_SEPARATOR = '/'
 FILE_HASH = 'Sha256'