Compressive behaviors of a pressed aluminized explosive with different densities (1.5,1.6,1.7 g·cm^-3) were investigated experimentally by split Hopkinson pressure bars (SHPB) and hydraulic testing machine at different strain-rates (ranged from 0.008 s^-1 to 800 s^-1) respectively. Nonlinear stress-strain curves at different strain rates were obtained. The results show that the mechanical behaviors of the aluminized explosive is obviously rate-dependent,and the corresponding failure stresses become higher if the original density or loading strain rates rise. A constitutive relation was established base on the experimental curves．