Based on the Environmental Kuznets Curve model, this paper takes the sewage discharge of 11 provinces ( cities and districts) as the research object in eastern China , uses the panel data of from 2006 to 2015 in all provinces and respectively analyzes the relationship among the total discharge, domestic sewage discharge, industrial sewage discharge and economic development with urbanization rate. The empirical results show that: first, the sewage discharge constitutes binary quadratic regression curve with economic development ( GDP ) and urbanization rate ( UR ) in provinces of eastern China. Different emission models have different relations with GDP, but they are linear regression with UR. Second, GDP and UR are the one-way granger causality for the discharge of domestic and industrial sewage. There is pairwise granger causalities for urbanization and economic growth and their changes directly lead to changes of sewage discharge. Third, there are different parameters of domestic and industrial wastewater discharge models which are related with urbanization rate and economic development. The urbanization rate has a positive impact on domestic sewage discharge and has a negative impact on industrial sewage discharge. Finally, because the change of urbanization rate is not identical with the change of economic growth, the graph of the sewage discharge model will be similar to the trend of the regression equation between sewage discharge and the rapidly changing variable within a certain period. It explains that other shapes dispute over sewage discharge and economic development.