Abstract: The combustion of fossil fuels emits a large amount of greenhouse gases.The study of carbon dioxide （CO₂） emission reduction and utilization has become a hot spot of worldwide concern and an urgent problem to be solved.The synthesis of methanol from CO₂ is an effective way to achieve large-scale low-carbon emission reduction and clean energy reproduction. However, there are still some technical problems in the process of CO₂ conversion of high value-added products, such as unclear reaction active sites and high catalyst cost. This paper takes the synthesis route of CO₂ as raw material into high value-added chemicals as the starting point, introducing the technical route and development status of methanol synthesis from CO₂ hydrogenation, and summarizes the factors affecting its selectivity in methanol synthesis process. It is found that catalyst is one of the important factors affecting the process of CO₂ hydrogenation to methanol and further compares the characteristics of different catalysts. In particular, copper-based catalysts have good catalytic activity for the synthesis of high yield and high purity methanol. Finally, it analyzes the mechanism and existing problems of copper-based catalysts in methanol synthesis in detail, and the changes in the activity, selectivity and stability of the catalyst were analyzed from three aspects: Active components,carriers and additives. In order to provide a theoretical reference for the preparation and screening of copper-based catalysts with high activity and low cost for CO₂ hydrogenation to methanol, it also analyzes respectively the effects of active components, supports and additives on the activity, selectivity and stability of the catalysts.