Abstract: The buffer is an important safety protector of antenna pedestal.Because the rubber cushion has simple structure,convenient assembly,light weight and low cost,the rubber cushion is widely applied in air-borne equipments.The structure form and the type of rubble material are main factors of rubber cushion affecting the anit-shock performance of antenna pedestal.In this paper,we compare three structures of rubber cushion,and provide a simple testing means of cushion toughness,we also evaluate if the rubber cushion satisfy buffer demand through exchange the kinetic energy to energy of deformation.