The eivilization has improtant significance on development of economics and controlling of growth rate of population. Urban e-cological system must satisfy people's basic living needs(convenience, comfort and especially healthy) for they constitute the main body of urban ecological system. Ecological construction must be strengthened in order to fit for the development of civilization. The key point of urban ecological construction is clean up the "four pollution"(waste gas, waste water, waste residue and noise) in the environment. The planning of city must be advanced and the ecological construction in the layout must be carried on with other urban construction and be completed in priority.