Up to now,the“up or out”system has undergone three stages of development in Chinese universities: pilot explora- tion,system preparation and multiple practice. From exploration to multiple practice,it is gradually adjusted and promoted under the multiple functions of political logic,market logic and academic evaluation logic. It is undeniable that the system of“up or out”has played an important role in building a high-level teachers team. But in practice,there are still difficulties and problems such as the personnel disputes caused by it are difficult to be effectively resolved through legal channels. The utilitarian tendency of scientific re- search output is easy to be induced,and the supporting measures for teacher mobility have not been established. In order to optimize the system of“up or out”and effectively protect the rights and interests of teachers,it is necessary to establish and improve the laws and regulations on the post appointment system. Establish the employment system based on post appointment,and comprehensively im- plement the employment system combining“pre-employment”and“long employment”. Further explore the mechanism of teacher mob- ility that is compatible with the“up or out”system.