Five kinds of wetland plants, including reed (Phragmites australis), oriental cattail (Typha orientalis), calamus (Zizania aquatica), wildrice stem (Acorns calamus), Iris (Iris temufolia), and one kind of shrub of willow (Salix viminalis) were selected to study the growth characteristics of plants and the role of removing nitrogen and phosphorus in severe eutrophic waters.The study showed that the six kinds of plants in experiments grew well and steadily.After 105 days, the total biomass ranged from 424 to 1772g/m².Ratios of most plant biomass above/below ground (A/U) varied between 0.63 and 1.49, except for oriental cattail (A/U:3.23).Concentrations of nitrogen and phosphorus in the biomass of above ground ranged from 13.12 to 28.83mg/g and frwn 1.55 to 3.77mg/g, respectively.Concentrations of nitrogen and phosphorus in the biomass below ground ranged from 7.76 to 15.60mg/g and from 1.70 to 2.71mg/g, respectively.The concentrations of nitrogen and phosphorus between alaove and below ground biomass differed significantly.The average plant accumulations of nitrogen and phosphorus were 20.60g/m² and 3.08g/m², which the above ground accounted for 66.60% and 58.22%, respectively.Purification efiect of the plants on dififerent pollutants was different.The best purification effects for TN in Iris and TP in reed were found.Plant accumulations of nitrogen and phosphorus displayed significantly positive linear correlation with plant biomass and concentrations of nitrogen and phosphorus.