The striking of single base propellant(SBP) grain on bullet bottom at high speed was simulated by experiment. The dynamic yielding stress (DYS) of SBP was calculated by using Taylor theory. The results show that the DYS is larger than the static yielding stress to SBP. The shape of SBP begins to change when striking speed of SBP is at 40 m·s^-1. When striking speed of SBP is over 190 m·s^-1,the grain will be broken. With the storage time prolonged,mechanical property of SBP tends to be bad.