To improve the surfaceoxidation of aluminum powder, and the catalytic effect on thethermal decomposition of energy materials, using electric explosive aluminum powder and copper chloride dihydrate（CuCl₂·2H₂O）as raw materials, the rapid deposition of nano-copper particles on the surface of aluminum powder was realized and the uniform coated Cu/Al composite was prepared by displacement method, in which nano-sized copper particles was made to cover the surface of aluminum powder.The structure and morphology of the composite were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray powder diffraction(XRD), energy dispersive spectroscopy(EDS),etc. DSC curves of the mixture of Cu/Al composite and RDX (mass ratio as 1∶5) at different heating rates were measured. The kinetic parameters of the thermal decomposition reaction of the mixture were calculated. Results show that the oxide layer on the surface of electric explosive aluminum powder is stripped by the etching of ammonium fluoride. The composite material contains simple substance aluminum and simple substancecopper crystallinephase, but no copper oxide and aluminacrystalline phases. Nano-sized copper particles are uniformly coated on the surface of aluminum powder andthe particle diameterof the composite is 200-500 nm. After the addition of Cu/Al composite,the initial decomposition temperature and peak temperature of RDX decrease by 8.51 ℃ and 26.43 ℃ respectively, the heat of decomposition increases by 296 J·g^-1, and the activation energy of thermal decomposition decreases by 19.19 kJ·mol^-1, indicating that Cu/Al composite can promote the thermal decomposition behaviorof RDX．