The eutrophication caused by nonpoint pollution is the typical water environment pollution in China's deteriorating lakes.The aim of this study is to probe the waterculturing technique of a rape by the use of artificial floating rafts so that the nutrient nutrition,such as nitrogen and phosphorus,could be extracted from the polluted water.By this approach,the lake eutrophication in the lake will be better treated while the nitrogen and phosphorus are absorbed into the rape.