To improve the photocatalytic performance of TiO₂, we prepared TiO₂/graphene composite (TiO₂/RGO) with a one-step hydrothermal method. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectra (RS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), transmission electron microscopy (TEM). The photocatalytic activities of the composites prepared with different mass ratio were evaluated using the photocatalytic degradation of methyl orange under visible light. The results showed that TiO₂ particles with an average size of 10 nm were dispersed on the surface of graphene sheets uniformly in the TiO₂/RGO composite. Compared with TiO₂ obtained under the same conditions, the absorption of TiO₂/RGO composite in the visible region was significantly enhanced and the absorption edge was showed a red shift of 20 nm. The photocatalytic degradation efficiency of the composite prepared with 1∶0.005 of mass ratio was about 74.79% after 2 h irradiation. The visible light catalytic performance of TiO₂ to incorporate graphene into TiO₂ can be effectively improved.