Abstract: Research concentration on the transmission and attenuation principle of vibration and energy through multi-layered, discontinuous structure interfaces is lacked, especially in the consideration of interface roughness. The “single absolute smooth metal panel--rigid plane” and “single rough surface metal panel--rigid plane” models are established in this paper to investigate the force-deformation relation and energy loss characteristics on the interface on the effects of plasticity and interface friction during the loading and unloading process. Results for interface of different plastic material models，frictionless and friction are presented and comparisons are drawn. The energy loss coefficient is defined and the expression relates energy loss and interface prosperities is established. Future work will concentrate on the transmission principle and attenuation characteristics of vibration and energy through multi-layered, discontinuous, rough interfaces.