Abstract: With the implement of China's Lunar Exploration Program in three stages,which consist of orbiting,landing,and returning, China's deep space TT&C(Tracking,Telemetry and Command)system has been built up. The future Mars Exploration Program will further enhance the full capability of the system. In this paper, the development of China's deep space TT&C system is reviewed,including the details of key technology research,top design,and system construction. The future trend of this system is discussed based on the latest development of deep space TT&C technologies.