Administrative division is the basic space unit of administrative management，which has the dual attributes of management and space，and involves major issues such as social stability，power relations，interest distribution and administrative efficiency. By reviewing changes in administrative divisions in 70 years of the People’s Republic of China history，analysis of the new changes in administrative divisions in 70 years，the main achievements，basic experience and the weak link，finally from the overall layout of a country comprehensive optimization administrative districts set up in China，administrative division adjustment power of urban agglomerations in the development of China’s economic transformation “main engines” and “position” role in innovation and development，administrative division adjustment to help small and medium-sized cities and counties to speed up the integration of development and improve the quality of development，administrative division adjustment power synchronous development of economic，society and ecological protection of small towns in four aspects，such as the focus of deepening the reform of administrative division in China are put forward.