Liangshan is the largest Yi nationality areas in China. The GDP of Liangshan is more than 100 billion yuan in 2000, which rarks the top in more than 30 national minority autonomous prefectures. Based on the data from the statistical department, consulting previous research on the index system for overall welloff society construction process, this paper measures and analyzes the completion of the overall welloff from 2000 to 2011. The results show that the completion degree of the overall welloff of Liangshan prefecture in 2011 reaches 66.6%, 15.2% higher than that in 2000, but the gap between Liangshan prefecture and Sichuan province or the national average level tends to enlargement. Finally, this paper analyzes the restricting factors of Liangshan prefecture overall welloff society construction, and puts forward some policy suggestions.