In order to build ecological Feng River,the paper explores and analyzes the relationships between the water quality and water flow on the basis of the regular water quailty monitoring data in Qinduzhen section from 2001to 2009,and the daily flow data in Qinduzhen hydrological station from 2001to 2009,and the flood monitoring data in Dayukou section and Qinduzhen section from 2009to 2011.The results show that the concentrations of NH3-N,TN and COD are affected by the size of the monitoring sectional flow and the average flow of every flood.In addition,there are differences in the relationships between the different sections of upstream and downstream in the river basin; According to the flood monitoring data of Qinduzhen section from 2002to 2008, we can see that the impact of flood on the non-point source pollution of COD is greater. The point source pollution of NH3-N and TN is prominent in 2006, and in other years, the point source pollution of NH3-N is serious and the change of TN is not stable.