Abstract: In the process of tractor parts and mechanism design optimization, in order to improve design efficiency and save design cost, it introduced inventor design simulation software, and proposed collaborative design and simulation method based on cloud technology. In the process of 3 D modeling and assembly and simulation of mechanical parts based on cloud platform, genetic algorithm is used for collaborative task allocation and resource scheduling The optimization is carried out to improve the efficiency of design and simulation calculation. Taking the modeling and Simulation of tractor motion mechanism as an example, it established the three-dimensional model and assembly of the mechanism by using the inventor software module of cloud platform, and it obtained the displacement curve of the mechanism with time by using cloud computing resources through simulation calculation. The calculation efficiency is compared with the traditional calculation platform, which verified the superiority of cloud technology in calculation speed and storage capacity.