Abstract: In order to meet the needs of multi-point repeated landing exploration on the lunar surface in the future, a leg-type reusable small lunar surface leaper is proposed. Firstly, a reusable landing buffer device was designed for the lunar surface leaper, introducing the basic configuration and repetitive buffering mechanism of the device. Secondly, a ground impact test system was established to verify the rationality of the design scheme at the working mechanism level. Thirdly, the single leg kinematics model and landing dynamics model of the landing buffer device are established, and the accuracy of the established mathematical model is verified by virtual prototype simulation. Finally, the optimization objective is to reduce the structural load on key parts of the landing buffer device during the landing buffer process, non-dominated sorting generic algorithm with elite strategy is used to optimize the design parameters of the buffer device, and the optimization results are verified by virtual prototype simulation. The research results indicate that the device's workflow meets expectations, and the optimized design parameters can reduce the structural loads of key parts during the landing buffer process by 12.49% and 7.33%, respectively. This can provide reference for the design of future lunar surface leaper.