Abstract: To further promote the photocatalytic performance of g-C₃N₄,TiO₂ quantum dots were loaded on g-C₃N₄ by a pore impregnating method.The results show that the TiO₂ quantum dots modification significantly influences the XRD patterns,surface parameters,particle size distribution and the visible light adsorption of g-C₃N₄.Using Rhodamine B as a simulated pollutant,the photocatalytic activity of obtained TiO₂/g-C₃N₄ was evaluated under a simulative sunlight irradiation.It is indicated that all the composites with TiO₂ quantum dots modification exhibit higher photocatalytic performance than the pristine g-C₃N₄.When the mass ratio of TiO₂/g-C₃N₄ is 3%,the composite displays the highest photocatalytic activity.The trapping experiments show that ·O^2- is the main active free species for the photocatalytic decolorization reaction.