Abstract：The effect of thickness of attenuation layer on dynamic response of supporting structure in multilayer protective structure is investigated emphatically. Firstly，the dynamic response of model experiment is simulated numerically in the case that TNT explosive is detonated on the upper surface of burster slab，and the results are compared with those of model experiment showing close agreement. Then，the deformation and failure of the supporting structure are studied for various thicknesses of the attenuation layer indicating that the thickness of attenuation layer has an important effect on the supporting structure；the failure zone is located on the top plate of the central span under detonation point，and the punching failure may appear when the thickness of attenuation layer is thinner than a critical value. The difference of the applied loading on the top plate at the end-span and that at the mid-span decreases by increasing the thickness and uniform distribution of loading of the attenuation layer. It is suggested that under certain condition，the dynamic response is weakened effectively by increasing the thickness of attenuation layer.
