Abstract:The relationship between the purification ability and the biomass, growth rate, evapotranspiration of 17 plant species of plants in heavy and light eutrophic water was studied through the minitype non matrix experiment of imitates glide state. Results showed that: (1)In heavy eutrophic water, improving plant biomass could increase the removal rates of N and P.(2) In light eutrophic water,the difference of removal rates caused by biomass in the same species of plant were less than that of different species....