The　XC-72R　supported　Pd　catalysts　exhibit　low-temperature　catalytic　activity　for　CO　oxidation　under　light　irradiation.　The　CO　conversion　can　reach　100%　with　the　light　irradiation　of　900　mW　center　dot　cm-2　at　a　catalyst　temperature　of　100　degrees　C.　Pd/C　catalysts　with　different　Pd　loading　have　similar　performance　enhancement　under　light　irradiation.　The　activation　energy　of　1%　Pd/C　catalyst　remains　unchanged　implying　that　CO　oxidation　belongs　to　photothermal　catalytic　oxidation.　The　enhanced　performance　could　be　ascribed　to　ultrahigh　surface　temperature　(275　degrees　C)　induced　by　the　light　irradiation　of　800　mW　center　dot　cm-2　and　detected　by　an　IR　camera.　That　is　higher　than　the　catalyst　temperature　(187　degrees　C)　measured　by　the　thermocouple.　Carbon　generates　a　higher　temperature　than　Pd　NP,　causing　heat　transfers　from　carbon　to　Pd　NP.　In　contrast,　Pd　NP　produces　a　higher　temperature　than　Al2O3　for　Pd/Al2O3　catalyst,　and　heat　is　transferred　from　Pd　to　Al2O3.　These　demonstrate　that　the　enhanced　performance　contributes　to　the　photothermal　effect　of　carbon.