Four kinds of hexanitrohexaazaisowurtzitane (CL-20) based composite particles were prepared by slurry method using CL-20 as filler, wax and Estane5703 as desensitizers. The crystal form, state of coatiing, thermal decomposition temperature of samples before and after coating were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), differential scanning calorimeter (DSC), and the mechanical sensitivity was tested. Results show that CL-20 is coated by wax and Estane5703 perfectly, and the ε crystal form of CL-20 was not changed. The impact sensitivity and friction sensitivity of CL-20 decrease from 100% to 40% and 48%, and thermal decomposition peak temperature increases by 5.4 ℃ compared with raw material when the wax and Estane5703 content are all 2%.