Abstract: Deformation and mechanical property of aluminium foams with lower densities were experimentally studied at different strain rates. Results show as follows: (1) the deformation characteristic of Al foams at a lower strain rate presents an initial crushing down of the cell support along shear direction (localized deformation); (2) the volume strain of Al alloy foams varies linearly with the engineering strain, Poissons ratio increases exponentially with strain at lower strain rates, but at higher strain rates, Poissons ratio first decreases, then keeps about 0.1; (3) at lower strain rates, the deformation of Al alloy foams is more uniform than that at high strain rates, but at higher strain rates, there is greater shearing deformation accompanying the high strain-rate deformations; (4) Al foam shows lower strain-rate dependence at the room temperature when strain is below about 0.4.