A new method that can apply DDAM to nonlinear stiffness system is put forward in the paper, an equivalent linear stiffness model with displacement restrictor is constructed, and the optimal scheme is designed. Pareto setting is obtained by finite element method and genetic algorithm, this pareto setting would be an excellent reference for engineering application. This design mode would assure excellent vibration and shock isolation at the same time, that is significative for vibration and shock isolation of onboard settings.