In order to improve the safety performance of potassium perchlorate （KClO₄）， KClO₄/ Silver （KClO₄/Ag） composite particles were prepared by chemical reaction of glucose and silver ammonia on the surface of KClO₄ particles. The particle morphology， phase composition， thermal decomposition temperature and mechanical sensitivity of the modified particles were analyzed by means of scanning electron microscope （SEM）， X-ray diffraction （XRD）， differential scanning calorimeter （DSC）， et al. The results show that KClO₄/Ag composite particles have obvious spherification effect， smooth surface and no obvious edges and corners. On the basis of retaining the original good stability and high decomposition temperature of KClO₄， it also has the characteristics of silver metal. Compared with the initial raw KClO₄， the mechanical sensitivity of KClO₄/Ag composite particles decreased significantly， the friction sensitivity explosion probability decreased from 90% to 50%， and the impact sensitivity explosion probability decreased from 70% to 40%. At the same time， the thermal decomposition performance of KClO₄/Ag composite particles is obviously different from that of raw KClO₄. The exothermic peak of KClO₄/Ag composite particles is 12 ℃ earlier and the decomposition efficiency is higher than that of raw KClO₄.