Abstract: By factor analysis, cluster analysis ,ESDA and other methods ,the spatial structure evolution of 77 Small Cities in China in 2011 and 2013 is discussed ,and the actors that influence the development of Small City are analyzed .The research shows that (1)The main factors that affect the spatial structure and the regional differences of the Small City are not big ,and the main factors are comprehensive strength factors ;(2)The overall level of the Small City in China is more obvious differences ;(3)The development pattern of the Small City in China is from the unipolar to the multistage ,from the “tower” type to “shuttle” type of the trend ;(4)The development of Small City is mainly influenced by the inherent requirement of the city ,and the inertia dependence and policy of the original resources endowment,and smart culture.The policy function is very significant .