Converting　CO2　into　value-added　compounds　via　photothermal　catalysis　is　a　promising　strategy　to　reduce　CO2　emission　and　might　be　a　sustainable　alternative　to　traditional　fossil　fuels.　Here,　we　report　nano-structured　a　Pt0.01Fe0.05-g-C3N4　hybrid　catalyst　synthesized　via　hydrothermal-method　and　further　reduced　under　reaction　condition　for　the　reverse　water　gas　shift　(RWGS)　reaction.　Taking　advantage　of　the　photo-thermal　effect　caused　by　the　near-infrared　(NIR)　and　visible　light　responsive,　the　hybrid　catalyst　produces　a　remarkable　activity　(7.36　mmol.h(-1).gcat(-1))　for　CO2　reduction　with　CO　selectivity　(97%)　under　300　W　Xe　lamp　irradiation　and　CO2/H-2　(V/V,　1/1)　feed　gas.　The　apparent　activation　energy　of　reaction　decreases　from　238.59　kJ/mol　to　48.88　kJ/mol　calculated　by　Arrhenius　formula.　In　order　to　comprehend　the　good　catalytic　activity　of　Pt0.01Fe0.05-g-C3N4　in　the　RWGS　reaction,　the　catalyst　is　characterized　with　powder　X-ray　diffraction　(XRD),　spherical-aberration-corrected　scanning　transmission　electron　microscopy　(Cs-S/TEM)　integrated　with　X-ray　energy　dispersive　spectroscopy　(EDS),　X-ray　photoelectron　spectroscopy　(XPS),　UV-vis-NIR　diffuse　reflectance　spectroscopy　(DRS),　etc.　for　investigating　the　structural　information,　surface　state,　optical　properties　and　so　on.　Results　show　that　the　presence　of　FeOx　and　Pt　exhibits　strong　absorption　in　a　wide　range　from　UV　to　NIR　regions.　Low　photoluminescence　(PL)　intensity　at　about　460　nm　shows　the　suppressed　photogenerated　carrier　recombination　process　of　Pt0.01Fe0.05-g-C3N4　due　to　the　heterojunction　between　FeOx　and　g-C3N4.　Operando　diffuse　reflectance　infrared　Fourier　transform　spectroscopy　(DRIFTS)　under　different　reaction　conditions　is　employed　to　investigate　surface　species　and　their　evolution　during　the　conversion　of　CO2　into　CO　and　a　broad　IR　absorption　is　observed　due　to　hydrogen　spillover　from　Pt　to　Fe3O4.　Therefore,　we　propose　a　possible　mechanism　of　photothermal　catalytic　CO2　reduction,　involving　separate　activation　of　CO2　and　H-2　over　Fe　and　Pt　acitve　sites.　Our　work　present　a　high-performance　Pt0.01Fe0.05-g-C3N4　catalyst　for　RWGS　reaction　and　open　a　new　vista　of　the　design,　synthesis　and　mechanism　research　of　photothermal　catalytic　CO2　conversion　in　the　future.