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Reduced graphene oxide/titanium dioxide (RGO/TiO2) composite photo catalysts were m-situ prepared by sol-gel method and modified Hummers method. The morphology and structure of photocatalysts were characterized and analyzed. The photocatalytic properties of the composite were studied by methylene blue (MB) as a simulated organic pollutant. The results show that a large amount of TiO2 particles are loaded on the surface of the RGO sheet to form a film with uniform dispersion. In the RGO/TiO2 composite. TiO2 is anatase and RGO still retains some oxygen-containing functional groups. The introduction of RGO causes the red shift of RGO/TiO2 absorption band, and the band width of RGO/ TiO2 is decreased from 3.2 to 3.0 eV. The RGO/TiO2 composite photocatalyst has good photocatalytic degradability and cycle stability. After 30 min of continuous illumination, the highest degradation rate of MB solution can reach 96.9%. After 5 cycles of photocatalytic degradation. RGO/TiO2 still has nearly 90% degradation efficiency. [ABSTRACT FROM AUTHOR]