Abstract: Lying on the Taihu plain are the three large-and medium-sized cities:Suzhou,Wuxi andChangzhou.The population and the land exploitation of the three cities are under rapid de-velopment along with the development of regional industry and agriculture.Nevertheless,owingto the disproportionate development of certain enterprises and services related to urban construc-tion,a series of problems of urban ecology have appeared.The relationships of the degra-dation of the urban ecological situation with the factors,such as population,land exploitation,hydrology and microclimate,were discussed.In order to improve the urban ecological situationof the three cities the following measures were suggested,readjustment of resional ecologicalenvironment by using the rich water resources in the region,rational distribution of thelarge-,medium-and small-city systems,and construction of traffic system and green landsin the city proper.

Key words: Copper, Soil, Tibet