The virtual prototype model of parallel displacement mechanism in the pumping unit transmission mechanism was established, and the dynamics simulation of parallel displacement mechanism with different materials worm gear was carried out by using ADAMS, the force curve was obtained, the rationality of the original design was verified and the optimal worm gear material was determined. The kinematics simulation of the parallel displacement mechanism was carried out by using ADAMS. The simulation results provide a basis for the optimal design of the parallel displacement mechanism.