Abstract: The study aims to reduce the cutting resistance of the existing silage corn chopping blade operation, in order to reduce the slant rate and improve the standard grass length, the pre-biomimetic beaver incisor profiled chopping blade was used to fit the characteristic curves and optimize the design. A systematic analysis was made to determine the parameters of the blade structure and the movable, as well as the fixed blade configurations. the original profile of the blade with non unibmn ratinalb splime (NURBS) curve was optimized using the least square method (LSM) with geometric constraints. A systematic analysis was made to clarify the relationship among the edge inclination and rake angle of the convex arc curve, as well as the force and strength of the cutting edge. A simulation was carried out using Rocky software. An experiment was then conducted to calculate the resistance changes of the three types of knives when cutting straw before and after optimization. The test results showed that the maximum cutting resistance of the optimized bionic blade was 625.05N, which was 13.42% lower than that of the flat straight blade. The three-factor, three-level orthogonal test was conducted to study the effect of the key parameters of the curved edge of the chopping blade on the maximum cutting resistance of the silage corn stalks, and the results of the bench test showed that the cutting resistance of the blade was the smallest when the angle of the outer sliding cutting was 30°, the tilt angle of the blade was 6°, and the bevel angle of the blade was 2°, and the maximum cutting resistance of the blade under the parameter of the simulation was 536.79N, which was 14.86% lower than that of the original biomimetic shaped blade. The quadratic rotation orthogonal combination test was carried out with the operating speed, the gap between the moving and fixed blade, and the spacing between the moving and fixed blade as the test factors, with the standard grass length rate and the oblique stubble rate as the evaluation indices. The test results show that when the operating speed was 1.94 m/s, the gap between the moving and fixed blade was 0.23 mm, and the spacing between the moving and fixed blade was 179.39 mm, the standard grass length rate was 93.64%, and the oblique stubble rate was 2.42%; the field harvesting results also show that: when the operating speed was 1.94 m/s, the gap between the movable and fixed blade was 0.2 mm, and the spacing between the moving and fixed blade was 178 mm, the standard grass length rate was 95.09%, and the oblique stubble rate was 2.50%, and the relative error between the experimental results and the optimized results was less than 5%, and the standard grass length rate of the commonly used flat straight blades was improved by 13.56%, and the oblique stubble rate was reduced by 3.06%. The results of this study can provide a reference for the design and optimization of silage corn chopping blades.