In order to study the new buffer technology, a compliant cushioning cradle and the stiffness calculation methods are proposed. In compliant cushioning cradle of automatic weapon station, for example, the compliant cushioning cradle is simplified to a vertical rod models and U rod model through the method of symmetry transformation, a theoretical method of compliant cushioning cradle-oriented can be obtained by analyzing the series and parallel relationship between the rods; use the software of solidworks simulation to make static simulation and apply hammering method to test the compliant cushioning cradle. Comparing the stiffness values of compliant cushioning cradle obtained by the three methods, the theoretical calculation method is proved to be accurate and feasible and the method can provide guidance for the design of compliant cushioning cradle and lay a certain foundation for the application of compliant cushioning cradle in cushioning areas.