Crystallized CeO2-TiO2 composite nanostructures were prepared by surfactant-assisted method using mixed solution of alkoxides at 353 K. The morphology and crystalline structure of CeO2-TiO2 composite were varied with changing the mole ratio of cerium n-butoxide/tetraisopropyl orthotitanate. These nariostructured materials after calcinations showed reaction activity to oxidize I- to I-2 owing to Lewis acid sites without irradiation of light.