The aim of this work was to test the cushioning property of polyurethane material, design appropriate ring damping buffer protection structure, so as to improve the buffer performance and stability of the system. Using a high overload test electronic recorder central damping buffer door structure as an example, damped mass spring system mathematical model was established, and the buffer performance of polyurethane material filled between the steel shell inner wall and the inner liner cover lateral wall as well as between the lateral walls of the inner container potting material was studied and analyzed through dynamic Machete hammer experiment. When the Machete hammer hit 10, 17, and 20 teeth, the minimum acceleration was all observed with the inner diameter of 46 mm. At the same pitch, the liner with a diameter of 46 mm had the smallest movement displacement relative to steel shell, and was the best design scheme.