This study focused on the photocatalytic CO2 to methane (CH4) with H2O over NH2-MIL-125(Ti) under visible light. It shows that the CH4 yield of NH2-MIL-125(Ti) reaches as high as 15.83 mu mol h(-1) g(catalysts)(-1), which is 82.6% higher methane (CH4) production than that of MIL-125(Ti). The amine functionalization promotes the CO2 adsorptions on amine groups and the electron transfer between Ti and organic clusters. The H2O acts as a good reductant in this catalytic system, which can provide the electrons and reduce the Ti4+ to Ti3+. This study provided a potential method to enhance the performance of photocatalytic CO2 conversion with H2O for the metal organic frameworks.