Aluminum split Hopkinson pressure bar(SHPB) with diameter of 14.5 mm was used to perform the uniaxial compression tests on base bleed grain specimens with diameter of 10 mm at the strain rate of 10³s^-1.Results show that the base bleed grain has obvious strain rate effects.Zhu-Wang-Tang (Z-W-T) constitutive model was adopted to describe the mechanical behavior of base bleed grain and the coefficients in Z-W-T model were obtained via the least square method based on the experimental results.Using the LS-DYNA software secondary development feature, the fitted Z-W-T viscoelastic constitutive relationship was embedded into the LS-DYNA software to simulate the experiments numerically.Comparisons between experimental and caculated results show that the numerical model can simulate the high strain rate properties of the base bleed grain very well in small-strain elastic range less than 0.03.