探讨了一种基于有限元技术的设计方法,该方法将拓扑优化、参数优化、概率设计技术有效的结合在一起.与传统设计方法相比,这种设计方法避免了一定的盲目性,提高了设计效率,设计结果具有更高的可靠性.将此方法应用于大型非公路自卸汽车的车架设计,取得了较好的效果. This paper discusses a design method based on finite element method, which combines topology optimization, parameter optimization and probability design technology effectively.Compared with traditional design methods, this design method avoids certain blindness and improves Design efficiency and design result have higher reliability.This method is applied to the frame design of large-scale off-highway dump truck and has achieved good results.