The study method used is the one investigating the effluent from activated sludge treatment and artificial wastewater in two experiments. The first experiment examined the nitrogen and phosphorus removal efficiency of effluent from activated sludge treatment by several plants. The second experiment explored the removed efficiency of different forms of nitrogen with different concent rations of phosphorus in the artificial wastewater. The aim of the study was to filter out the proper plant varieties for eutrop hication treatment. Results showed that the three plants of I pomiea aquatica Forsk

Rumex acetosa L

and Cy perus glomerat us L had perfect purification capacity and growth in good condition. The concent ration of nit rogen and phosphorus in the effluent decreased during experiment

especially TN removal reached more than 90% by Cyperus glomerat us L and R umex acetosa L Cy perus glomerat us L had the best removal efficiency of 93.4 %

the removal rate of TP exceeded 70%

and I pomiea aquatica For skhad the best removal efficiency of 76.9 %. In the pretreatment

NH4+-N had significant changes and Cy perus glomerat us L treatment showed the best purification of 94.4 %. The content of NO3--N gradually decreased in preexperiment period and then showed an increased tendency. The best removal efficiency by Rume xacetosa L reached 65.4 %. Nitrogen and phosphorus removals in control treatment were lower than in treatments of plant system. The experiment for different forms of nitrogen removal with different concent rations of phosp horus in the artificial wastewater by three plants showed that both N H4+-N and NO3--N were absorbed by the three plants

with the priority absorption of N H4+-N. The order of plant purification effect for NH4+-N and NO3--N was Cy perus glomerat us D L > Rumex acetosa L > I pomiea aquatica Forsk.