in this paper, Adams simulation technology is used to study the dynamic characteristics of the RV reducer, and the characteristics of the speed reducer and the contact characteristics between the cycloid gear and the cycloid gear are studied. The angular velocity of the main parts of the reducer is calculated by theoretical derivation. The maximum contact force of the program is based on Hertz formula. The correctness of the simulation model is verified from two aspects: the transmission ratio and the maximum contact force. After studying the maximum contact force by two methods, the position of the maximum contact force and the contact force are determined, which provides theoretical guidance for the reduction of the contact force and the optimal design of the cycloid disk.