Objective:To analyze the stability of a self-driving climbing-stair wheelchair designed in this study. Method: The ultimate tensile load of the chains was analyzed. For the problem of side-tumbling, the stability was analysed in two sides:①The position of center of gravity of the wheelchair affected by length and width of the supporting frame was analysed. ②The friction force between the track and stair when climbing stairs was analysed. Result:The ultimate tensile load of the chains was 201.6kN.The positio...