Abstract: Based on the theory of locally resonance, a kind of composite which contained metal rubber as basic framework, acid sillcone as matrix and plumbum balls as scatterer was designed. The influences of composite parameters (filling rate of metal wires, diameter of small plumbum balls, filling rate of small plumbum balls) and thickness of air layer behind composite on low-frequency sound absorption property of metal rubber composite was studied by sound absorption tests. The results show that metal rubber composite had the excellent low-frequency sound absorption property. The reduction of filling rate of metal wires, increase of diameter and filling rate of plumbum balls all could improve the low-frequency absorption property of composite. With increase of air layer thickness, the frequency of the resonant sound absorption moved towards the direction of low-frequency.