Localized　surface　plasmon　resonance　applied　in　catalytic　and　optical　field　has　attracted　more　attentions　in　recent　years.　Plasmonic　MoO3-x　nanosheets　with　tunable　oxygen　vacancies　were　constructed　via　facile　solvothermal　method.　The　as-prepared　MoO3-x　nanosheets　were　found　to　have　LSPR　absorption　band　centered　at　680　nm,　and　exhibited　excellent　photocatalytic　performance　in　photodegradation　of　organic　dyes　and　tetracycline　under　visible　light　irradiation.　X-ray　photoelectron　spectroscopy　showed　the　higher　content　of　surface　oxygen　vacancies　in　MoO3-x　(88　mmol).　Photocurrent,　electrochemical　impedance　spectroscopy　and　photoluminescence　results　demonstrated　that　MoO3-x　(88　mmol)　exhibits　the　best　photo-induced　electron　hole　separation　efficiency　and　the　highest　charge　transfer　efficiency.　Taken　together,　oxygen　vacancies　are　not　only　responsible　for　the　light　harvesting　in　the　visible　and　near-infrared　region　via　LSPR,　but　also　play　a　key　role　in　greatly　suppressing　the　recombination　of　photoexcited　carriers.　Moreover,　electron　paramagnetic　resonance　revealed　that　photoinduced　h(+)　and　center　dot　OH　radicals　act　as　the　main　reactive　species　participating　in　the　photoxidation　process.