Abstract: In order to improve the design and processing efficiency of tractor case parts, it introduced UG software into the process of digital design and processing of parts. And it optimized the processing technology and route of box parts by using the modeling and data processing simulation functions of UG software. In order to verify the feasibility of the method, taking the modeling of tractor box parts and NC milling simulation as an example, it compared the processing trajectories before and after intelligent optimization of the processing route, verified a number of different groups of parts. From the comparison results, we can see that the total processing process after intelligent optimization was adopted. The trajectory distance of the trajectory is smaller than that before optimization, which effectively improves the milling efficiency of the shell parts of the tractor case.