The first button of civil servants' shirts, short sleeves and ties should be tied. If you wear a tie, you'd better fasten all the buttons, which will look more tidy. If you don't wear a tie, you don't need to fasten your buttons too tightly for the time being.

For more information about civil servant interviews, please refer to: Sichuan Zhonggong Education-Civil Servant Interview Network.

If in doubt, please consult the public education enterprises in China.