Abstract: In order to improve the cutting performance of blades, a study was made on the cutting process of corn rootstalk. By the use of theoretical analysis and cutting test experiment, the cutting dynamic model and energy consumption model were established, and the relationship between optimized sliding-cutting angle and friction angle was revealed. According to the friction properties of corn rootstalk, corn rootstalk profile was divided into 5 region, the friction coefficients of every region was measured, and the optimized sliding-cutting angles of every 5 region was determined. At last, the blade with multilevel sliding cutting angle was designed, and compared with the traditional blades with fixed sliding cutting angle. The cutting test result showed that cutting energy consumption of blade with multilevel sliding cutting angle was the lowest, which was 14.2 J.