Abstract: One of the difficulties frequently encountered in eco-environment quality assessment is that not one but all the affecting factors associated with eco-environment quality must be used. To overcome this issue, the principle of projection pursuit was introduced, and the projection pursuit cluster (PPC) model that can realize the transition from high dimension to one-dimension was stated in this paper. As an application example, the eco-environment quality assessment of Chaohu Basin in Anhui Province was presented. The eco-environment quality of total Chaohu Basin area, Hefei City and Liu’an City were of grade 3, and that of Chaohu City was of grade 4. The results suggested that PPC model was reasonable and more objective, which could be a powerful tool in complex multifactor analyzing, and a new method for eco-environment quality assessment.

Key words: Tibet, Environment, Fluorine, Tea