The experimental system was established according to vibration isolation model; the stiffness and damping coefficient was measured and analyzed. The excitation was exerted by vibration excitation platform; the acceleration was measured by two accelerators and the vibration transfer ratio curve of the cushion packaging system including the foam material was measured; the damping ratio was obtained by applying nonlinear fitting method and then the stiffness and damping coefficient was calculated. The experimental results showed that the stiffness of the foam material descends with its thickness increase; damping coefficient also descends with its thickness increase in the specific scope; with the increase of thickness, the lower limit frequency of cushion packaging system decreases; the more the thickness of the foam material, the better the vibration isolation effectiveness in specific range; however, the vibration isolation effectiveness decreases when the thickness beyond specific value.