Multi-objective optimization design of the gas-filled bag cushion landing system is investigated.Firstly,the landing process of airbag is decomposed into a adiabatic compression and a release of landing shock energy,and the differential equation of cylindrical gas-filled bag is presented from a theoretical perspective based on the ideal gas state equation and dynamic equation.Then,the effects of exhaust areas and blasting pressure on buffer characteristics are studied,taking those parameters as design variable for the multiobjective optimization problem,and the solution can be determined by comparing Pareto set,which is gained by NSGA-Ⅱ.Finally,the feasibility of the design scheme is verified by experimental results of the ground test. Multi-objective optimization design of the gas-filled bag cushion landing system is investigated. Firstly, the landing process of airbag is decomposed into an adiabatic compression and a release of landing shock energy, and the differential equation of cylindrical gas-filled bag is presented from a theoretical perspective based on the ideal gas state equation and dynamic equation. Chen, the effects of exhaust areas and blasting pressure on buffer characteristics are studied, taking those parameters as design variable for the multiobjective optimization problem, and the solution can be determined by comparing Pareto set, which is gained by NSGA-II. Finaally, the feasibility of the design scheme is verified by experimental results of the ground test.