The main essential factors in the enterprise include the human capital,and financial material capital.With the change of the economic and technical conditions,the negotiating capability of the essential factors changes accordingly.These will influence the ownership structure.The factors,which could change the negotiating capability,include the size,the environment and the technology of the enterprise.In this sense,it is impossible for different enterprise to choose the same ownership structure.Even the same enterprise should select different ownership structure and adminisration mechanism in different situations.