Abstract: At present several popular feed formulation softwares in China adopt Linear Programming and Goal Programming to optimize formula design. Adopting these methods to optimize formula design can't get a satisfying result immediately, and formula need to be adjusted for many times. Fuzzy Linear Programming can adjust the formula according to the flexible restraint given by formula expert, and a satisfying result can be obtained. The article introduced the mathematics model and the algorithm of Fuzzy Linear Programming into optimizing formula design, and provided Fuzzy Linear Programming flowchart. Through an example, the superiority and inferiority of the three optimizing methods were compared objectively too.