TiO2 nano thin film and TiO2/ZnFe2O4 nano composite thin film were prepared on glass substrate by dip coating process. The films were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photo-electron spectrum (XPS), atom force microscope (AFM), Uv-vis spectroscope, etc. The obtained films were analyzed and were proved to be anatase alone. At the same time, the photo absorption edge of the composite film was red-shifting. Finally, photocatalytic decomposition properties of methylene blue were tested and discussed.