The purpose of this paper is to realize the sustainable development of Three Forks Lake and control pollution.It analyzes the water quality of Three Forks Lake in the following aspects: PH, NH3-N, total phosphorus , total nitrogen, permanganate index, transparency, TDS DO, conductivity. The author did some researches on water environment of Three Forks Lake by means of Cluster analysis and Inverse Distance-weighted Interpolation. The study reveals that most water area of Three Forks Lake is

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... uted seriously because the water here is having a PH greater than 7 and a greater turbidity, and the water nearer to inland is harder, having more nitrogen, higher permanganate index , less dissolved oxygen. This paper not only theoretically studiess the water quality of Three Forks Lake by cluster analysis, but also get a conclusion of pollution with the combination of the information from Figure 1 , Figure 3 and Figure 4 , which bascially identical with the authority's data.