The work aims to study the dynamic cushioning property of expanded polypropylene materials. Dynamic compression test was carried out to the expanded polypropylene materials and the effects of densities, thickness and drop height on dynamic cushioning property of expanded polypropylene were analyzed. The higher the density of expanded polypropylene was, the greater the acceleration and static stress corresponding to the lowest point of the dynamic cushioning property curve were, and the greater the lowest point of the buffer coefficient was. The thicker the expanded polypropylene was, the smaller the maximum acceleration at the lowest point of the curve was and the greater the static stress was. With the increases of drop height, the maximum acceleration corresponding to the lowest point of the curve increased, but the static stress decreased. For the weight reduction and cost saving, the polypropylene materials should be selected within a safe range with reference to density, thickness and actual transportation environment of materials.