Detonation pressure and detonation velocity of RDX-based aluminized explosive with different charge densities and charge sizes were measured by using manganin pressure transducers and probes,respectively. The relationship between detonation pressure and charge density,as well as the relationship between detonation velocity and charge density,were fitted,and then the effects of charge density and charge size on detonation pressure or detonation velocity of RDX-based aluminized explosive were analyzed. The results show that the detonation pressure and detonation velocity are both increasing with the increasing of charge density. When the charge diameter is 20 mm and the charge length is 40 mm,RDX-based aluminized explosive is already at steady detonation,and the charge diameter and the charge length do not affect the measurement of detonation pressure and detonation velocity.