The board of supervisors of a joint stock limited company shall be composed of three or more persons. A joint stock limited company must set up a board of supervisors, and there must be representatives of employees in the board of supervisors. The duty of the board of supervisors is to supervise the behavior of the company's senior managers in performing their duties.
According to Article 117 of the Company Law of People's Republic of China (PRC), the composition and term of office of the board of supervisors: A joint stock limited company shall have a board of supervisors with no less than three members. The board of supervisors shall include an appropriate proportion of shareholders' representatives and employees' representatives, of which the proportion of employees' representatives shall not be less than one third, and the specific proportion shall be stipulated in the articles of association.