JO-8 and Composition B were investigated by low-speed impact loading test using the small hammer of 30 kg, and their impacting courses were studied by the high speed photography, and the residue after impacting were analyzed by the scanning electric microscopy(SEM). Results show that the ignition threshold of JO-8 is 360 N and that of Composition B is 300 N, which indicate that JO-8 has better anti-impact property than Composition B. Two explosives exercise shocking, plastic flowing, flying and reacting, and the reacting happens after the explosive is damaged with the residual explosive. The damage pattern of Composition B is focused on the interface debond and rupture across the crystal, and the JO-8 explosive is on the shear distort and rupture through the crystal. Because of the preparation process of Composition B, RDX is surrounded by TNT, and the lower mechanical properties of TNT cause the Composition B rupture under impact loading before that of JO-8. While the addition binder improves the brittle characteristics of the explosive HMX and made its damage pattern different from the composition B. The good compressed strength makes JO-8 explosive ignition delay.