Currently,　the　production　of　solar　fuels　by　the　photoreduction　of　CO2　with　H2O　is　limited　by　the　slow　reaction　rate　and　low　efficiency　of　solar　energy　conversion.　Combining　concentrated　solar　power　and　plasmonic　nanomaterials　is　a　promising　strategy　to　enhance　photothermal　transformation　and　promote　solarto-fuel　conversion.　Herein,　a　nanocatalyst　comprising　gold　anchored　on　TiO2　was　fabricated　using　a　regular　deposition-precipitation　method.　The　nanocatalyst　showed　improved　performance　in　CO2　reduction　with　H2O　under　concentrated　full-spectrum　irradiation　owing　to　the　coupling　of　photo-　and　thermal　energies.　Macroscopic　experiments　demonstrated　a　clear　correlation　between　the　light　intensity　and　the　syngas　yield,　and　a　CO2　conversion　rate　of　6.35%　was　achieved　after　3　h　under　simulated　sunlight　illumination　of　1644　mW/cm(2).　Photoelectrochemical　measurements　and　finite　element　method　simulations　indicated　that　Au/TiO2　achieved　better　separation　and　transport　of　the　photoexcited　carriers　than　TiO2　owing　to　localized　surface　plasmon　resonance　that　heats　the　nanocatalysts　under　concentrated　full-spectrum　irradiation.　In　situ　diffuse　reflectance　infrared　Fourier　transform　spectroscopy　analysis　also　suggested　that　the　photothermal　effect　accelerates　the　formation　of　intermediates　such　as　formate　and　acetate　and　therefore　enhances　the　overall　photocatalytic　rate.　These　results　highlight　the　excellent　potential　of　combining　concentrated　solar　power　and　plasmonic　nanostructures　to　realize　the　synergistic　utilization　of　photon　energy　and　thermal　energy.　Such　a　combination　not　only　promotes　the　solar-to-fuel　conversion　efficiency　but　also　paves　the　way　for　future　applications　in　large-scale　scenarios.