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A novel chlorine-doped titanium dioxide catalyst with visible light response was prepared by hydrolysis of tetrabutyl titanate in hydrochloric acid.The catalyst samples were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM),X-ray photoelectron spectroscopy (XPS),and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS).Results showed that the doped element of CI lowered the temperatures of phase transformation of TiO2 from amorphous to anatase and from anatase to rutile.The absorption edge of chlorine-doped TiO2 calcined at 300℃ shifted to visible light region.X-ray photoelectron spectroscopy results proved that chlorine existed in the TiO2 crystal lattice as anion.The photocatalytic degradation of phenol showed that under visible light (λ>400 nm)irradiation,the chlorine-doped TiO2 calcined at 300℃ displayed the best performance,the degradation ratio of phenol was 42.5% after 120min.