A　novel　method　of　modifying　thermoplastic　polyurethane　(TPU)　by　the　introduction　of　multi.　dimensional　nanocomposites　composed　of　graphene　oxide　nanoribbons　(GONRs)　and　carbon　nanotubes　(CNTs).　in　which　GONRs　are　two.　dimensional　and　CNTs　are　one.　dimensional.　was　applied.　Different　content　ratios　of　GONRs-CNTs　nanocomposites　were　prepared　through　oxidative　longitudinal　unzipping　of　MWCNTs.　and　the　ratio　of　the　two　was　controlled　by　changing　the　amount　of　potassium　permanganate　in　the　reaction　system.　And　then　the　different　nanoparticles　were　added　into　TPU　matrix　to　yield　GONRs-CNTs/TPU　composite　films.　Fourier　transform　infrared　spectroscopy　(FTIR).　X-ray　diffraction　(XRD).　thermal　gravimetric　analysis　(TGA).　X-ray　photoelectron　spectroscopy　(XPS).　transmission　electronic　microscopy　(TEM)　and　field　emission　scanning　electron　microscopy　(FE-SEM)　were　used　to　study　the　structure　and　properties　of　the　different　GONRs-CNTs　hybrids.　Meanwhile.　by　means　of　oxygen　transmission　rate　test.　tensile　test　and　the　observation　of　surface　morphology.　we　studied　the　synergetic　effect　of　GONRs　and　CNTs　and　the　effect　of　their　content　ratio　on　the　barrier　and　mechanical　properties　of　TPU　composite　films.　The　results　show　that　a　new　structure　is　successfully　obtained.　in　which　GONRs　are　bridged　by　CNTs.　and　the　synergy　between　GONRs　and　CNTs　has　a　better　performance　than　pure　MWCNTs.　When　the　content　ratio　of　GONRs　to　CNTs　in　the　added　filler　is　about　67:33.　the　barrier　and　mechanical　properties　of　GONRs-CNTs/TPU　composite　films　approach　the　optimum　value:　the　oxygen　transmission　rate　is　reduced　by　51.3%　and　the　tensile　strength　increased　by　29.3%　compared　with　those　of　the　pure　TPU.　respectively.　It　suggests　that　the　addition　of　GONRs/CNTs　nanocomposites　is　beneficial　to　improve　the　barrier　and　mechanical　properties　of　TPU.