In the future， manned spaceflight， base construction and other missions require the lander to have the functions such as soft landing， reusable and adjustable attitude / movement. The traditional lander based on material plastic deformation energy absorption mechanism will not meet the corresponding requirements. A passive controllable electromagnetic buffer with damping force is proposed， which can realize the functions of compliant falling earthquake， reusable， adjustable attitude and feasible walking of the lander catalogue. The structure design， theoretical analysis and simulation verification are completed. Firstly， a new type of reusable lander using electromagnetic buffer as auxiliary buffer pillar is proposed， and the main performance index and structural parameters of the electromagnetic buffer are obtained through the dynamic analysis of falling earthquake. Secondly， the internal structure design of electromagnetic buffer and the realization mechanism of passive controllable damping force based on sliding resistance guide rod are introduced. Finally， the virtual prototype modeling and simulation are completed by the finite element method to verify the functional effectiveness of the electromagnetic buffer， and the key electrical parameters such as energy consumption resistance and excitation current are determined. The electromagnetic buffer innovatively realizes the approximately linear smooth change of damping force， so as to effectively reduce the instantaneous impact overload of the lander， improve the flexibility of the falling earthquake process， and limit the maximum overload coefficient within the required range. It provides a buffer energy absorption solution for the development of a new type of lander for the future star catalog soft landing mission.