The eutrophication caused by nonpoint pollution is th e typical water environment pollution in Chinas deteriorating lakes. The aim o f this study is to probe the waterculturing technique of a rape by the use of ar tificial floating rafts so that the nutrient nutrition, such as nitrogen and pho sphorus, could be extracted from the polluted water. By this approach, the lake eutrophication in the lake will be better treated while the nitrogen and phospho rus are absorbed into the rape.