In order to study shock attenuation in aluminum foams,the different thickness of aluminum foam shells were made,shock attenuation in its was preliminarily investigated. Two types of PETN charges were used,one is the PETN itself,the others are confined by aluminum foam shell with thickness of 1.5 cm,2.5 cm and 3.5 cm. The shock wave pressure-time curves were obtained at 0.5 m away from the charge. The experimental data analysis show that aluminum foams shell not only can weaken the peak pressure，but also effectively absorbs the specific impulse and the specific energy of shock wave. Moreover,the whole deforming,crushing and moving processes of the shells were recorded by the underwater camera system. Results show that the attenuation of shock pressure,specific impulse and specific energy in aluminum foams shell was induced by itself deformation and breakup. At the same time,the thickness of aluminum foams shell impacted on the shock attenuation in aluminum foams.