Being one of the key corporate governance mechanisms, the board of directors plays an important role in corporate performance. The board of directors' daily operation directly embodies the function of corporate governance and value creation. The paper shows that more times of meeting of listed companies' boards of directors in China mainland don't obviously improve companies following performance, but to some extent bring negative effects, and the board of directors couldn't control expense efficiently. Empirical study points out that the quality of their boards of directors' behavior should be improved.