Constructing　defect　sites　on　the　surface　of　a　catalyst　is　an　important　strategy　used　to　achieve　efficient　reverse　water　gas　shift　(RWGS)　reaction.　In　this　work,　the　oxygen　vacancies　(OVs)　and　Mn2+　site　were　successfully　created　on　the　surface　of　Pd/SrMnaZrOx　catalysts　to　enhance　the　adsorption　and　activation　of　CO2.　Based　on　the　results　of　in-situ　DRIFTS,　quasi-situ　EPR,　and　XPS　measurements,　which　revealed　that　CO2　adsorbed　on　the　OVs　and　Mn2+　sites　and　was　activated　into　CO　species.　Under　UV-vis　light　irradiation,　photo-generated　electrons　from　SrMnaZrOx　migrated　to　the　surface　of　Pd　nanoparticles,　which　was　favorable　for　the　activation　of　H2.　Meanwhile,　visible　light　causes　the　conversion　of　Mn3+　to　Mn2+,　and　promotes　the　formation　of　OVs　around　the　converted　Mn2+　sites.　This　formed　＂cycle-double　sites＂　(both　OVs　regeneration　and　Mn2+　reformation)　enhances　the　activity　and　stability　of　RWGS　reaction　on　the　prepared　catalyst　with　UV-vis　light.