Abstract: We expand the STIRPAT model and calculate industrial agglomeration, comprehensive polluting index and environmental regulation level about 286 prefecture-level cities from 2003 to 2013, mainly discusses the effect of urban industrial agglomeration to the urban environment. Industrial agglomeration effects on urban environment not there are simple linear relationship of increasing urban pollution or reduce the pollution of the city, but there is a certain critical point, the empirical test shows that urban industrial agglomeration effects on urban environment present a "U" shaped the evolution law of industrial concentration degree of logarithmic 3.1161 as a turning point. Based on this, this paper puts forward the ecological industrial cluster development mode, including ecological industrial park development pattern and urban functional zoning development mode, which makes industry agglomeration in the process of promoting economic growth, but the pollution emissions doesn't increase, industrial agglomeration, economic growth and ecological environment in a benign interaction among them. In addition, the reasonable control of the urban population scale, improvement of environmental regulation level and optimizing the industrial structure is an important way to improve the urban environment.

Key words: industrial agglomeration, urban environment, effect, evolution rule