1.IntroductionChina is now amid rapid urbanization,which,no matter in terms of scale or speed,is unprecedented in the human history.The history of urban development shows that the sustainability of a city is actually determined in the early stage of its 1.IntroductionChina is now amid rapid urbanization, which, no matter in terms of scale or speed, is unprecedented in the human history. History of urban development that that the sustainability of a city is actually determined in the early stage of its