A kind of ski-buffer-solution is presented for the parachute recovery according to the requirements of UAVs (unmanned aerial vehicles). The performance of the landing buffer device is mainly achieved by the shock absorber. The key of virtual prototype design is shock absorber modeling. The traditional method is mainly theoretical formula method, which accuracy is difficult to determine. The shock absorber tests are very simple. A dynamical model of the shock absorber is established by using the experimental results of shock absorber static and dropping tests. Based on the dynamical model of shock absorber, a multi-body dynamical model of the full aircraft is established. Then the dynamical characteristics of the UAV landing process are simulated. The simulation results are in good agreement with the experimental results. The dynamical response of the ski structure is analyzed by the nonlinear dynamic simulation with FEM. According to the simulation, the design parameters are optimized finally. The high precision dynamical model established in the paper fully meets the engineering requirements, greatly reduces the test cost, and shortens the development cycle.