In today’s rapid development of private equity investment funds, whether the private equity can improve and support corporate management and boost enterprise business performance becomes the focus concerned by the this field. This paper takes 92 private equity investment funds in the listed mediumsized and small enterprises as the samples to study this topic, and the results find that in the enterprises supported by private equity investment funds, there is a positive relation between board member wage and corporate business performance, that there is a negative relation between meeting frequency of the board of the directors and leverage level as well as business performance, however, there is no significant relation among the scale of board of directors, leadership structure and the shareholding ratio of board members. 