Abstract: As the high-speed development of industry and agriculture, non-controlled eduction of live sewage, relative lag of cure of water pollution and its own water character, the current eutrophication status of Taihu lake, the mostly component of Taihu valley, is dangerous and has endangered the economy development and people’s natural life in the Taihu valley. The eutrophication of Taihu lake is a representative ecological problem, so it can be controlled by some ecological control countermeasures, such as resuming aquicolous vegetation, restricting the area of breed aquatics in the Taihu lake, biologically manipulating alga, building ecological agriculture section around the Taihu lake and resuming the zoology of Taihu bank .