In recent years, graphene has become a research focus because of its unique electrical properties and high specific surface area. In this study, graphene was prepared by the oxidation-reduction method, and then TiO2/ graphene (GN) composite photocatalyst was prepared by hydrothermal method. The composite was characterized by TEM, XRD, BET, UV-Vis DRS. The experiment showed that with the increase of graphene ratio, the light absorption region of the composite expanded into visible region, and its surface area increased. The TiO2/ graphene has better adsorption and photocatalytic degradation efficiency for methylene blue (MB). The saturated adsorption capacity of P25-10%GN for MB is 50mg/g at pH 8and room temperature.