In this paper, the analytical method of multivariate variance is applied to study the function of the various performance factors of the straight-edge cylindrical cutter. Research results indicate that the main factor impacts the model type surface straight blade cylinder type chopped knife is the speed of the blade, and the application of regression analysis method establishes the regression equation of the blade of stem cutting speed and cutting length, cutting speed and stem throwing distance, speed and power consumption. This paper introduces how to choose chopped knife work parameters with the application of these regression equations.