The gun propellant shock wave sensitivity was investigated by the gap test, including single-base, double-base, triple-base and azide nitramine (DA) propellant with shape of globe, 6/7 and 17/19. The gun shock wave response of propellant was studied. The effects of gun propellant shape the shock wave sensitivity was investigated. Results indicate that the more energy ingredients (RDX, NG, DA), the higher the shock wave sensitivity of gun propellant is and the different kinds of energy ingredients affect the shock wave sensitivity differently. The bigger the gun propellant shape, the less the sample shock wave sensitivity is. On the base of these experiments, the concept of propellant ingredients shock wave sensitivity quantification count is putted forward, that can be used to study propellant shock wave sensitivity deep.