In　order　to　improve　the　mechanical　properties　of　cementitious　materials　reinforced　with　polyvinyl　alcohol　（PVA）fibers，graphene　oxide（GO）was　introduced　into　cementitious　materials　reinforced　with　PVA　fibers，and　the　effects　of　GO　dosage　in　the　range　of　0%-0.05%　on　the　uniaxial　tensile　properties　of　the　materials　were　investigated.　The　results　show　that　the　appropriate　GO　dosage　can　effectively　improve　the　uniaxial　tensile　properties　of　the　materials，and　the　initial　crack　tensile　strength，ultimate　tensile　strength　and　ultimate　tensile　strain　of　the　cementitious　materials　reaches　the　maximum　value，increased　by　26.97%，31.28%　and　23.25%，respectively　compared　with　the　control　group　without　GO　at　the　age　of　28　d，when　GO　dosage　is　0.01%.　An　appropriate　GO　dosage　can　optimize　the　pore　structure，reduce　internal　defects　in　the　material，facilitate　the　formation　of　hydration　products，enhance　the　density　of　the　material’s　microstructure，and　improve　the　interfacial　bonding　force　between　the　fibers　and　the　matrix，thus　enhancing　the　macroscopic　properties　of　the　materials　reinforced　with　PVA　fibers.　©　2024　Tongji　University.　All　rights　reserved.