Light-driven CO2 reduction technology is expected to reduce CO2 emissions and provides high-value chemical fuels at the same time to alleviate the pressure during energy transition. Among them,the development of highly active photocatalysts is the key to realize the application of this technology. Loading noble metals is an effective way to improve their photocatalytic efficiency. However,the high cost and scarce reserves of noble metals limit their large-scale use. Therefore,the development of precious metal substitutes is great significance for photocatalytic CO2 reduction. Mo2C is a transition metal carbide with an electronic structure similar to that of noble metal. Mo2C and Cu co-loaded TiO2 photocatalysts were prepared by urea reduction. Their photocatalytic activity under UV light was evaluated by combining physical and chemical properties analysis. The results show that after loading Mo2C on TiO2,the production of H2 and CH4 is significantly promoted in the process of CO2 catalytic conversion,while Mo2C and Cu coprecipitation can inhibit the production of H2 and promote the further conversion of CO2 to CH4. After four hours of illumination,its cumulative CH4 production reaches 76.1 μmol/g,which is 5.6 times that of pure TiO2. Cu deposition can promote CO2 adsorption and inhibit water vapor adsorption,thereby reducing H2 generation. The co-deposition of Mo2C and Cu can effectively reduce the bandgap width of TiO2,inhibit the recombination of photo generated electrons and hole pairs,and promote the separation and transfer of photogenerated charges on the catalyst surface,thereby improving its photocatalytic activity.