Aquatic plants is an important component in lake ecosystem and sediment-water interface is one of the most important interfaces in nutrient cycle.We studied the effects of the contents of N,P etc.in sediments and their overlying water at three different sampling sites in Xiangxi River,Lake Taihu and Lake Donghu,and microelectrodes are applied in this study to investigate the vertical section by the effect of H.verticillata.The results show that H.verticillata grows quickly in different sediments.The growth rates of H.verticillata in different types of sediments are different,and H.verticillata has certain tolerance to pollutants.Secondly,H.verticillata has certain influence on both sediments and the overlying water,such as lowering down the contents of TN and TP and so as to purify water and lake bottom sediments.Thirdly,H.verticillata could increase the content of oxygen in water and the thickness of the aerobic layer,and change oxidation-reduction potential.Fourthly,H.verticillata may change the number and species of microbes in microenvironment in sediments,and then change the contents and/or levels of pH,N₂O,H₂S etc.in overlying water and sediments.