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La-doped TiO2 films were prepared by sol-gel method with tetrabutyl titanate(Ti(OC4H9)4),and Lanthanum oxide(La2O3)as raw materials on the ITO glass-substrate.Structure,optical and electrochromic properties of La-doped TiO2 films are characterized by means of X-ray diffraction(XRD),cyclic voltammetry(CV)and ultraviolet-visible spectrophotometer(UV-vis).