The abundant growth of algae is the main waste characteristic of eutrophic lake and other water. In this paper,the growth characteristic,ecology and alimentation of algae in eutrophic lake and other water were reviewed. Specifically,the interferences of algal blooms on lakes were briefly addressed. The apply methods,such as food,medicine,photoelectricity material,toxin were introduced significantly. The foregrounds of the applying of algae were forecasted as a conclusion.