Abstract: City suburbanization is a change of city's spacial structure and a process of population,political and economic center movement form downtown to suburbs.The US is a typical country of city suburbanization,the process of which had been completed in general before the early 1970s and is still continuing in some way.Suburbanization of cities has exerted deep influence on American society,economy,polities,culture,education and ideology.This article analyzes the cause and tendency of American city suburbanizatio...