Pure　SrTiO3　cubes　with　perovskite　structure　were　prepared　by　a　molten　salt　method.　The　novel　visible　light　active　photocatalysts　were　obtained　as　a　result　of　surface　modification　of　SrTiO3　cubes　with　Cu　ions　by　an　impregnation　technique.　The　as-prepared　samples　were　characterized　by　an　inductively　coupled　plasma　atomic　emission　spectrometer,　X-ray　diffraction　(XRD),　scanning　electron　microscope　(SEM),　X-ray　photoelectron　spectroscope　(XPS),　and　UV-Vis　diffuse　reflectance　spectroscope　(DRS).　The　decomposition　of　gaseous　2-propanol　was　chosen　as　a　probe　to　evaluate　the　photocatalytic　activities　of　the　samples　in　air.　The　results　show　that　the　visible　light　photocatalytic　activities　of　the　samples　can　be　significantly　enhanced　by　grafting　amorphous　Cu(II)　clusters　on　the　surfaces　of　SrTiO3.　Under　visible　light　irradiation,　electrons　in　the　valance　band　of　SrTiO3　are　transferred　to　the　surfaced　Cu(II)　clusters,　leaving　holes　with　strong　oxidizing　power　in　the　valance　band　and　producing　Cu(I)　clusters.　The　Cu(I)　clusters　can　efficiently　reduction　oxygen　molecules　via　a　multi-electron　reduction　process　to　consume　the　excited　electrons.　On　the　other　hand,　the　generated　holes　can　decompose　the　organic　compounds.　As　a　result,　the　complete　decomposition　of　gaseous　2-propanol　into　CO2　can　be　achieved　over　the　Cu(II)-SrTiO3　under　visible　light　irradiation.