5G mobile communication system will provide mobility management independent of wireless technology, and can ensure the continuity of business and communication quality, no matter how the user's location changes. This paper first analyzes the design objectives of 5G mobile communication system, such as low latency, low power consumption, high reliability and flexibility. Secondly, the three main scenarios of 5G mobility management are analyzed, which are distributed mobility management scenario, centralized mobility management scenario, distributed centralized hybrid scenario. Finally, the two solutions of 5G mobility management network control switch and terminal automatic control switch are compared and analyzed.