One of the major problems of water pollution that we faced as whole world is eutrophication. Today, more than 90% of all the lakes in China have become or becoming eutrophication. Too much nutrients in water body leads to the algae multiplying excessively, and finally causes the eutrophication. The eutrophication is the presentation of the senescence of water body and the worse of water quality. Cultivating higher plants on the water surface is one of the effective roads to purify eu...