Abstract: Nonwoven aramid felt, damping elastic films, and double, three layer compound structure nonwoven aramid felt/damping elastic film composite materials were prepared. Standing wave tube test method was used to investigate the influence of sound absorption coefficient in different thickness of aramid felt and different compound structures of the composite. Aramid felt and damping elastic film were placed in reverberation and anechoic room to test the sound-insulation capabilities. The results showed that the sound absorption and sound insulation properties of the three-layer composite material was superior to a composite of two layers; for the same thickness of three layer compound materials, good sound-absorption property of the surface layer material should be selected.