The process of carbon dioxide reforming to methanol is of great significance for the efficient use of carbon sources and environmental protection, used as a way to replace the traditional high energy consumption and high emission steam reforming process. With aid of Aspen Plus, the process of methane to methanol in closed loop carbon dioxide reforming was simulated. The results showed that the exergy loss of this process mainly concentrated on the chemical process, accounting for 76.47% of the total exergy loss. The combustion reaction and reforming reactions accounted for 41.62% and 27.69%, respectively, while the methanol synthesis reaction and the water gas shift reaction accounted for 3.55% and 3.61%, respectively. Compared with the traditional steam reforming methanol process in the case of a certain amount of raw material methane input, the carbon dioxide reforming methanol system reduced in exergy loss of 21.44%, in water vapor consumption of 77.02%, in overall system carbon dioxide emissions of 25.89%, and increased in methanol production of 12.03%. In addition, in order to further improve the efficiency of the carbon dioxide reforming methanol process, the impacts of temperature and pressure in the reforming process were analyzed, showing that the exergy efficiency and methanol yield of the system increased first with the increase of reforming reaction temperature, then stabilized, and the reached maximum at 980℃. And the lower reforming reaction pressure was, the more beneficial improved methanol production.