Hollow spheres/aluminum matrix composite foams with different porosity were prepared by powder metallurgy technology and T7 heat treatment, and the compressive properties and sound insulation properties of different porosity materials were tested. The results show that hollow spheres in matrix are distributed evenly, and transition layer between hollow spheres and matrix could be observed obviously. The compressive stressstain curves of composite foams are mainly divided into three stages: linear elastic stage, stress plateau stage and densification stage. With the increasing of porosity, the compressive peak strength, platform stress and energy absorption capacity of the hollow spheres/aluminum alloy composite foams increase first and then decrease. And with the increasing of porosity, the sound insulation property of the materials decreases gradually.