Abstract: In this paper,Fuzzy Pattern Classification Method based on Genetic Algorithm(GA)is proposed.It's used to the identification of crude oil nature in the Tarim Basin.The clustering center and weight vector are determined with GA and the degree of compatibility of every crude oil sample is determined too.The results of classification for 20 specimen indicated that the performance of this method is good,and it might be referred as an assissant technique to the identification of crude oil nature.