In order to prevent the aggregation and growth of HMX explosive crystal, the influence of different addition of PVP on shapes and growth of HMX crystals was studied by the spray-crystal method and heat dying, using polyvinyl pyrrolidone as reagent of shape control, DMSO as solvent and deionized water as anti-solvent. The characterization and functional group of PVP-HMX particles were researched by the field emission scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR). The impact sensitivity of PVP-HMX was tested by standardization method GJB772A-1997. The results show that the crystal size distribution of HMX is the same as before heat drying when PVP addition was 0.4%. The particle size of HMX is nearly spherical, and size distribution is under control of 1-3 μm. HMX has not appeared new functional group peak. In comparison with the raw materials HMX, the characteristic drop height of impact sensitivity H₅₀ of PVP-HMX increases by 248.3%.