The　selective　reduction　of　nitroaromatics　has　long　been　the　focus　of　fundamental　and　practical　interest.　The　challenging　issue　lies　in　how　to　finely　control　the　product　selectivity.　Herein,　we　report　a　light-assisted　thermocatalytical　process　to　convert　nitrobenzene　into　azobenzene　and　hydrazobenzene　with　high　selectivity　and　high　yields　by　simply　controlling　the　reaction　time.　The　light-enhanced　efficiency　of　Au/TiO2　catalyst　is　up　to　14.8%　at　90　degrees　C　due　to　the　localized　surface　plasmon　resonance　(LSPR)　effect　of　Au　nanoparticles.　Moreover,　the　hydrogen-delivery　rate　here　is　much　faster　than　that　of　current　reported　systems.　The　reaction　mechanism　was　also　investigated　by　EPR　technique,　where　Au-H　intermediate　species　is　found　to　account　for　the　high　efficiency　in　this　reduction　process.　The　favorable　results　demonstrated　that　plasmon-enhanced　catalytic　reaction　might　be　more　attractive　and　applicable　in　industrial　organic　synthesis.