The mesoporous TiO₂ nanocomposites were fabricated in a water bath at lower temperatures using the sol-gel method with a comb-type polymer as template and tetrabutyl titanate as Ti source. The Ag/AgBr/TiO₂ nanocomposites with higher specific surface areas were obtained by the introduction of Ag/AgBr on the surface of the mesoporous TiO₂ using a deposition-precipitation method. The as-prepared nanocomposites were characterized by X-ray diffraction (XRD), N₂ sorption analysis, transmission electron microscope (TEM) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The results showed that both the as-prepared TiO₂ and Ag/AgBr/TiO₂ exhibited mesoporous structure. The introduction of Ag/AgBr not only decreased the specific surface area of the mesoporous TiO₂ from 346 m2/g to 253 m2/g, but also significantly increased its visible light photocatalytic activity. The degradation rate of methyl orange under visible light irradiation over Ag/AgBr/TiO₂ was 145 and 60 times of those over the commercial TiO₂ P25 and the mesoporous TiO₂, respectively.