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The uniform,transparent nano-TiO2 films were prepared by sol-gel method on common soda lime glass.The technique for producing TiO2 films was discussed,and the structure,grain size and the film transmittance were characterized by X-ray diffraction(XRD) and ultraviolet spectrophotometer.The hydrophilicity and photocatalytic activity of the films were studied under the UV light.The results indicate that TiO2 films made have higher self-cleaning activity.