Abstract: The problems of three aspects,properties of sediment particles,characteristics of sediment motion in polluted waters,such as,sediment motion in the sewage oxidation pond and in river mouths,and transport-transfor mation of heavy metal pollutants,non-degradable organic matters,nutritional sustances and oil pollutantin natural waters,were discussed in this paper.According to these discussion,it is necessary to using environmental sciences,such as,water environment chemistry,environmental geochemistry and hydrochemistry,and hydraulic sciences,for example,hydraulics and mechanics of sediment motion to study the problems in aquatic environment.