Photocatalytic　converting　CO2　into　C-2　products　is　highly　desirable　but　is　extremely　sensitive　to　catalyst　structure.　In　this　work,　Ti-H　species　and　oxygen　vacancies　are　simultaneously　integrated　on　hydrogenated　SrTiO3　surface　by　thermally　treating　with　NaBH4,　which　promotes　the　activation　of　CO2　into　HCOO-　and　CO*　intermediates.　The　proximity　of　oxygen　vacancies　and　Ti-H　species　contributes　to　the　C-C　coupling　of　intermediates　into　acetylene　(C2H2)　products.　To　the　best　of　our　knowledge,　this　is　the　first　example　for　the　photocatalytic　CO2　reduction　into　C2H2　main　products.　The　optimal　hydrogenated　SrTiO3　has　the　C2H2　yield　of　39.0　mu　mol　center　dot　g(-1)　with　a　76.0　%　selectivity　among　C-2　products.　Therefore,　this　work　provides　an　approach　of　designing　the　adjacent　active　sites　for　photocatalytic　CO2　conversion　into　C2+　products.