Abstract: At present,the problem of ecological fragility is becoming more serious in Qionghai Lake basin,Sichuan Province.In this paper,the fragile characteristics of Qionghai lake basin were analyzed,with four structurally vulnerable factors and three artificially menacing factors which caused the problem put forward.The index system of fragility was set up,and the assessment of fragile degree was further implemented by means of AHP.The results showed that the value of integrated index was 3.035,and the fragility degree reached medium-strong level.The assessment identified the primary and secondary factors,with which,the related restoration and control strategies were approached based on the current conditions of the eco-environment.

Key words: Windbreaks/shelterbelts, Porosity, Snow depth, Distribution pattern