Abstract: In the southern part of the East Route Project of South to North Water Transfer,sediments in rivers and lakes were monitored and the washing experiment carried out in the reach of the Bulao River.Based on the data from the sediments monitoring and washing experiment,impacts of pollutants in sediments on the water quality was assessed.The results show that the maximum concentrations of dissolved Hg,As,TP,TN,COD\-\Cr\ and COD\-\Mn\ are higher and these may become potential polluting sources.It could be concluded that impact of pollutants in sediments on the water quality is relatively small from the washing experiment under the similar conditions of water transfer project.