In order to reduce the sensitivity of 2, 4, 6, 8, 10, 12-hexanitro-2, 4, 6, 8, 10, 12-hexaazaisowurtzitane (CL-20), CL-20/3, 5-dinitrobenzoic acid (DNBA) spherical composite was prepared by ultrasonic-assisted emulsion method under room temperature using ethyl acetate as solvent and gelatin as the surfactant. Its morphology and structure were characterized by scanning electron microscope (SEM), X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FT-IR). In addition, the thermal decomposition performance were measured by differential scanning calorimetry (DSC). The impact sensitivity and friction sensitivity were tested by GJB772A-1997. Results show that the surface of the composite particles is smooth without obvious edges and the particle size is uniformly distributed with an average particle size of 6.7 μm. XRD and FT-IR tests indicate that there is a certain interaction between the two molecules, which may form a new spherical composite structure. Compared with the raw CL-20, the impact sensitivity and friction sensitivity of CL-20/DNBA spherical composite significantly decrease with the H₅₀ of CL-20/DNBA spherical composite increasing from 13 cm(raw CL-20) to 50.4 cm and the explosion probability decreasing from 100%(raw CL-20) to 65%. At the same time, the thermal decomposition performance was significantly different from that of raw CL-20. The exothermic peak was 20.3 ℃ ahead of raw CL-20.