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CuO/SiO2 nanocomposite films were prepared by sol-gel process combined with the dip-coating teclmique.The microstructure of resulting samples were measured by X-ray diffraction (XRD),the optical absorption spectra of the prepared samples were measured at room temperature on spectrophotometer.Pore structure and aperture distribution were analyzed on Omnisorp-100CX specific surface analyzer.The results indicated that the mean diameter of CuO nanoparticles formed during the heat treatment process and mainly lay in the pores of mesoporous SiO2 matrix increased by increasing the heat treatment temperature.Consequently,compared with mesoporous SiO2 matrix,the pore volume and specific surface area of prepared samples descend.The diffraction peaks of Cu and CuO and the crystalline diffraction ring of CuO with body centered cubic structure can be clearly observed after heat-treated in air and H2 at 800℃ for lh.By increasing the heat treatment temperature and concentration of CuO,a slightly red-shill could be observed.