The crystal quality and properties of spherical HMX such as particle size distribution, morphology, particle defects, chemical purity, thermal properties and sensitivities were characterized by laser light scattering, optical microscopic, optical microscopic with matching refractive index, density gradient technique, differential scanning calorimetry (DSC)and sensitivity tests. Results show that the crystal quality of HMX particles is improved after being spherically disposed. Comparing with original HMX particles, spherical HMX particles become more round and more smooth, their internal and surface defects are reduced, the particle diaphaneity is better, the particle density distribution becomes narrow, thermal stability and rheology of explosive based on spherical HMX particles are improved.