With the stricter control of point source pollution,non-point source pollution caused by rainfall runoff is paid more and more attention.The pollution load and the first flush effect of urban runoff were analyzed on the basis of stormwater runoff analysis.The results reveal that the concentration fluctuation of TN,TP and CODMn for the urban runoff are 0.03~52.27,0.01~18.85 and 0.27~111.26 mg/L respectively.In road runoff,the pollution of different functional areas followed the sequence of traffic area>comme...