A　novel　CdS/La2Ti2O7　nanocomposite　photocatalyst　working　under　visible　light　was　prepared　by　a　simple　sonochemical　coupled　method.　The　catalyst　was　characterized　by　powder　X-ray　diffraction,　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　and　UV-vis　diffuse　reflectance　spectroscopy.　The　nanocomposite　exhibited　a　strong　photocatalytic　activity　for　decomposition　of　methyl　orange　(MO)　under　UV　and　visible　light　irradiation.　Moreover,　the　nanocomposite　with　La/Cd　=　1:3　shows　the　highest　photocatalytic　activity.　The　enhanced　photocatalytic　performance　might　be　attributed　to　the　layered　structure　of　CdS/La2Ti2O7　nanocomposites　and　the　matched　band　potentials　of　the　two　semiconductors.　(C)　2011　Elsevier　B.V.　All　rights　reserved.