Graphene　oxide　nanoribbons(GONRs)　were　prepared　through　oxidative　longitudinal　unzipping　of　multiwalled　carbon　nanotubes,　and　then　modified　by　silane　coupling　agent,　KH-570.　The　functionalized　GONRs(K-GONRs)/EVA　composite　films　were　subsequently　obtained　by　solution　coating　method　on　a　coating　machine.　Structures　and　properties　of　the　K-GONRs/EVA　composite　films　were　characterized　by　FTIR,　XRD,　XPS,　TEM,　FE-SEM,　oxygen　transmission　rate　tester　and　electronic　universal　testing　machine.　The　results　show　that　the　thin　banded　K-GONRs　with　interlayer　spacing　about　0.970nm　are　successfully　prepared,　and　there　is　an　increasing　in　interlayer　distance　about　0.095nm　for　K-GONRs　when　compared　with　original　GONRs.　Meanwhile,　the　prepared　K-GONRs　is　neat　and　with　uniform　shape　and　low　defect,　dispersed　evenly　in　EVA　matrix.　Comparing　with　the　pure　EVA　films,　when　the　mass　fraction　of　K-GONRs　is　1%,　the　oxygen　transmission　rate　of　K-GONRs/EVA　composite　films　is　reduced　by　54.5%　and　the　tensile　strength　is　increased　by　89.3%.The　barrier　property　and　mechanical　properties　of　EVA　is　obviously　improved.　©,　2015,　Beijing　Institute　of　Aeronautical　Materials　(BIAM).　All　right　reserved.