Abstract: Lake eutrophication is an ecological issue,and a concentrated reflection of the environmental problems in the catchment where the lake lies.An ecological problem should be solved through ecological ways.The key to regulating water environment lies mainly in rural area,while controlling rural environment pollution depends mainly on ecological means.Only when a catchment is deemed as a holistic ecological system,within which relationships between various factors are regulated to realize balanced ecosystem,can the water environment problem of lakes be solved at the root.