RDX was coated with hyantoin/triazines composite bonding agent and the effects of the processing parameters,including reaction time, reaction temperature and bonding agent mass on the coating degree were studied by means of water-solution suspending method in the L₉(3⁴) orthogonal experiment. The coated RDX was characterized by X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM), Fourier transform infrared spectroscopy（FTIR）, differential scanning calorimetry（DSC） and impact sensitivity (H₅₀). The optimum conditions are as follows: 10.0 g RDX, reaction time 90 min，reaction temperature 50 ℃, 0.3 g composite bonding agent (CBA), and stirring speed 700 r·min^-1. Accordingly,coating degree is up to 87%. It is found that surface of the coated RDX is covered by clear film with a thickness of about 0.2 μm. In FTIR spectra, NO₂ group absorption peak has a 22 cm^-1 red shift to 1510 cm^-1and the absorption band widened. Thermal decomposition peak temperature is enhanced 0.4 ℃. The characteristic height of impact sensitivity (H₅₀) is increased by 4.5 cm.