Abstract: Multi-layered space plates of aluminum alloy penetrated by a tungsten sphere is experimentally investigated. The relationship between the number of plates perforated by the tungsten shpere and impact velocities are obtained.On the basis of the observation of the impact velocity, modes of destruction of the plates, deformation of spheres and plugs critical condition of rupture of the sphere are given, and theoretical formulas of calculation for the sphere's deformation and perforation of plates are established. Satisfactory correspondence is obtained between th eexperimental results and the calculated values. The multi-layered plates when perforated by steel sphere and tungsten sphere respectively are compared and analyzed.