The cushioning package was predigested as a double degree-of-freedom system. The movement differential equations were transformed into dimensionless equations and then state equations in form of matrix. By using Matlab/Simulink, the simulation models were established. The forced vibration and drop response of cushioning package were analyzed. And the relationships between the response and mass ratio, damping ratio, frequency ratio, dropping height were discussed. The simulation can avoid unnecessary destructive tests and provide theoretical basis for optimizing cushioning package.