The paper aims to effectively reduce the damage of instrument caused by the impact energy to protect the internal device effectively. Tilt functional metal materials were filled in thin-walled metal tubes and simulated. Then, based on the energy absorption and buffering principles, the traditional energy absorption devices were analyzed, and a new energy absorption and buffering scheme was proposed. Compared with the traditional energy absorption structure, the energy absorption performance of the new composite structure was increased by an average of 4.67%. The technical feasibility of the scheme was demonstrated by numerical simulation and experimental comparison. The new filling structure proposed in this paper has obvious effect on energy absorption. It basically meets the expected requirements.