Abstract: The nature of buffer system is very important factor to determine the dynamic properties of the success of docking operation in space.Due to lack of the experiment equipments,the dynamic simulation on computer is an effective method to test and verify the parameters or evaluate the performance of the buffer system designed.In this paper,for the androgynous and peripheral type docking mechanism with electromechanical buffer system,the influence of the buffer system on the docking process is studied in help of the dynamic simulation in detail.The conclusion provides basis of the engineering design of the buffer system.