Abstract As the core content of state-owned enterprises reform, Chinese state-owned enterprises have some problems in corporate governance for a long time, which restricts the process of the reform and development in these enterprises. As a breakthrough in deepening the reform of state-owned enterprises, the mixed-ownership reform has opened up a new theoretical research direction and reform practice space for state-owned enterprises to carry out and improve corporate governance. Under the framework of corporate governance and contemporary property rights theory and based on the analysis of the characteristics and existing problems of corporate governance in Chinese state-owned enterprise groups, this paper summarizes the framework and specific measures that can be taken by state-owned enterprises to improve corporate governance under mixed-ownership reform.