Abstract: The influence of the loading amount of TiO₂ on the photocatalytic H2 production performance of TiO₂@H⁺/g-C₃N₄ composites were studied. Graphite phase carbon nitride（g-C₃N₄） was first treated with sulfuric acid to obtain pickled carbon nitride（H+/g-C₃N₄）, and then TiO₂@H⁺/g-C₃N₄ composites were prepared by loading TiO₂ on the surface of H+/g-C₃N₄ by calcination method. The photocatalytic hydrogen production of TiO₂@H⁺/g-C₃N₄ composite was characterized by transmission electron microscopy, X-ray diffractometer, UV-vis diffractometer and specific surface analyzer. The photocatalytic performances of H2 production of TiO₂@H⁺/g-C₃N₄ composites were investigated under the irradiation of visible light. The photocatalytic hydrogen production mechanism of TiO₂@H⁺/g-C₃N₄ composite was discussed.The results show that the TiO₂@H⁺/g-C₃N₄ composites are synthesized by calcination. The photocatalytic property of H+/g-C₃N₄ is increased by the loading of TiO₂, which is due to the separation promotion of the photogenerated electron-hole pairs and the acceleration of the electrons transfer rate by TiO₂/g-C₃N₄heterojunctions. Moreover, the loading amount of TiO₂ has great effects on the photocatalytic H2 production performance of TiO₂@H⁺/g-C₃N₄ composites. With TiO₂ loading of 25%, the photocatalytic H2 production rate of the prepared 25-TiO₂@H⁺/g-C₃N₄ composite is the highest, which is 3. 47 mmol·g-1·h-1and about 4.05 times of that of H⁺/g-C₃N₄. This good property is attributed to the large specific surface area and high absorbance of 25-TiO₂@H⁺/g-C₃N₄ composite. Moreover, the prepared 25-TiO₂@H⁺/gC₃N₄ composites show good stability in the process of photocatalytic H2 production.