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.