In order to understand the decay rate of HMX-based explosives before and after aging, two kinds of HMX-based explosives with different binders were selected for aging test. The density of explosives was obtained by calculation, and the detonation velocity of the samples was obtained by electric detonator detonation test method. The results show that the aging time has different effects on the density of explosives. The aging of 8 days is the boundary point between the density changes of two kinds of explosives. The density of the samples changes greatly over 8 days; the detonation speed of the two explosives decreases significantly with the aging time, but The explosive rate of H-2 explosives is always higher than that of H-1 explosives.