I found that
deprecation_warnings=False setted in /etc/ansible/ansible.cfg has no effect when I have ~/.ansible.cfg.
So I check the document, it says
Changes can be made and used in a configuration file which will be searched for in the following order:
ANSIBLE_CONFIG(environment variable if set)
ansible.cfg(in the current directory)
~/.ansible.cfg(in the home directory)
Ansible will process the above list and use the first file found, all others are ignored.