The removal efficiency of nitrogen and phosphorus in eutrophic lake water by attached Cladophora oligoclona has been investigated at the conditions in laboratory and outdoor

respectively.The results showed that attached Cladophora oligoclona grew quite well and had high removal rates of N and P in the eutrophic lake water at the concentrations of TN 10.512 mg/L

NH4-N 8.563 mg/L

TP 0.856 mg /L and PO4-P 0.573 mg/L.The average removal rates of TN

NH4-N

TP and PO4-P from the eutrophic lake water by C.oligoclona were 53.13%

44.40%

35.71% and 30.53% in a 12-day culture at laboratory conditions.The total removal rates of the four parameter were 93.81%

94.62%

79.67% and 77.66%

with a daily reducation of TN 1.643 5±0.413 9 mg/L

NH4-N 1.350 3±0.352 4 mg/L

TP 0.113 7±0.041 1 mg/L and PO4-P 0.074 2±0.033 0 mg/L

by the algae in a 6-day culture under outdoor conditions.The growth of Microcystis flos-aquae could be torestrain by Cladophora oligoclona

the limited rate was reached to 99.63% in a 6-day culture in laboratory.The algae growth potential of the treated eutrophic lake water was reduced 40.17% of the original lake water.The results showed that attached Cladophora oligoclona was suitable for treating the wastewater with high concentrations of phosphorus and nitrogen.