The transfer process of shock waves in supporting structure of rigid-flexible-rigid(R-F-R) can be simplified as one-dimensional stress wave propagation in the structure. The law of shock wave pressure attenuation affected by porous metal materials and the shock wave pressure decay influenced by thickness and density of porous metal materials were obtained by the impact theory analysis of prevent blunt mechanism of R-F-R supporting structure. The impact energy-absorption ability of three types of supporting structures was studied by drop hammer impact test. At the same time, the spread and attenuation process of impact wave in R-F-R supporting structure was analyzed. The calculation results show that the shock wave pressure applied to the surface of R-F-R supporting structure is 30.7% of the shock wave pressure applied to the surface of steel bracket, and the R-F-R supporting structure absorbs energy about 94.8% of the total energy. The experimental results also show that the shock wave pressure applied to the surface of R-F-R supporting structure is 50% of the shock wave pressure direct applied to steel bracket, the R-F-R supporting structure can absorb more than 70% of the total energy.