The work aims to improve photocatalytic performance of graphite carbon nitride (g-C3N4). Graphene oxide (GO) and g-C3N4 were prepared by Hummers method and one-step semi-enclosed pyrolysis method respectively, then TiO2/g-C3N4, ZnO/g-C3N4 and RGO/g-C3N4 composites were fabricated in solvothermal method, thermal polycondensation method and impregnation chemical reduction method, respectively. The composite materials were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance absorption spectroscopy (UV-Vis DRS) and Fourier transform infrared spectroscopy (FTIR). Simultaneously, photocatalytic performance of the composites was evaluated based on degradation reaction of Rhodamine B (RhB). The g-C3N4 prepared in pyrolysis method and made of melamine and urea exhibited higher photocatalytic activity than that made of pure urea. The introduction of TiO2, ZnO and RGO considerably enhanced photocatalytic activity of g-C3N4, and degradations rate of RhB rate was 95.6%, 95.0% and 78.1%, respectively. The RGO/g-C3N4 composite exhibited highest catalytic efficiency provided with 2.0 wt% RGO. Absorption intensity and electron conduction capability of the composites as well as photocatalytic performance in visible light are improved due to special band control advantage of g-C3N4 and synergistic effect among TiO2, ZnO and RGO.