Testing the applicability of Zipf’s law and Gibrat’s law in the distribution and growth of China’s city size is helpful to analyze the evolution trend and rationalization characteristics of China’s urban system. The results show that China’s city size distribution generally obeys Zipf ’s law，but there are obvious divergence features and trends. The distribution of city size presents a flat feature in the central region，while other regions have obvious divergence features and trends，which are related to their inter-region difference．The growth of city size at the national and regional levels basically obeys Gibrat’s law，which is related to the rapid population growth of small and big cities, while the slower growth of population in medium-sized cities．Therefore，the focus of future urbanization development needs to be adjusted，and the central region should focus on the development of big cities, while other regions should focus on the coordinated development of big, medium and small cities. It is also necessary to increase policy inclination form edium-sized cities and enhance the spatial spillover effect of big cities to ensure population growth in medium-sized cities．
