The first chapter introduces the basic concept of fuzzy set, the basic method of establishing membership function of fuzzy set and the application of functions in Matlab fuzzy toolbox. The second chapter discriminant analysis methods include distance discriminant method, closeness discriminant method of fuzzy sets and maximum membership principle. In chapter 3, based on the concept of fuzzy matrix, the basic method of fuzzy clustering and the Matlab implementation of fuzzy C-means clustering are given. The fourth chapter is fuzzy comprehensive evaluation, and the comprehensive evaluation method of objective weight vector and fuzzy matrix is established. The fifth chapter introduces the modeling method and application of fuzzy analytic hierarchy process. The sixth chapter introduces fuzzy linear programming, fuzzy optimal solution of multi-objective programming and application examples of fuzzy linear programming in economy on the basis of ordinary linear programming.