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SiO2 films were deposited on single-crystalline silicon substrates by ion beam sputtering technology.Optical constants of SiO2 films are calculated from spectroscopic ellipsometry data,transmittance spectra and reflectance spectra by WVASE32 software,and the best fitted method is obtained for calculating optical constants of dielectric materials in the ultraviolet-visible-infrared (UV-VIS-IR) range.In the UV-VIS-NIR spectral range,refractive indices of SiO2 films are calculated separately by both ellipsometry data and reflectance spectra,and the obtained results are almost the same.Complex dielectric functions of SiO2films in the IR spectral range are accurately calculated with infrared transmission spectra using the GenOsc model.The obtained accuracy complex refractive index of SiO2 films in the wavelength region from 0.19μm to 25μm is of great importance for the design of high quality coatings,such as ultra-low loss coating.