In　order　to　improve　the　barrier　properties　of　thermoplastic　polyurethane　(TPU),　first,　functional　graphene　oxide　(IP-GO)/TPU　composite　films　were　prepared　by　solution　casting　method　on　the　coating　machine.　Then,　the　morphologies　and　properties　of　IP-GO/TPU　composite　films　were　investigated　by　FTIR,　XPS,　XRD,　FE-SEM,　atomic　force　microscope　and　oxygen　transmission　rate　tester.　The　results　indicate　that　the　layer　spacing　of　IP-GO　increases　of　0.696　nm　compared　with　the　primitive　flake　graphite　and　the　thickness　of　sheets　is　about　1.2　nm.　IP-GO　evenly　dispersed　in　TPU　matrix　by　form　of　fold　layers,　and　coated　on　the　fracture　surfaces　of　composite　films.　When　the　contnent　of　IP-GO　is　3wt%,　the　oxygen　transmission　rate　of　IP-GO/TPU　composite　film　is　84.325　cm3/(m2·d·Pa),　compared　with　the　pure　TPU　film＇s　value　which　is　280.973　cm3/(m2·d·Pa)　decreases　by　70%,　reveals　that　the　barrier　property　is　improved　significantly.　The　research　solves　the　problem　of　poor　barrier　performance　of　TPU　films,　and　provides　a　thought　and　a　method　for　the　preparation　of　high　barrier　polymers.　©,　2015,　Beijing　University　of　Aeronautics　and　Astronautics　(BUAA).　All　right　reserved.