Abstract: The current pressure and trend of CO_2 emission reduction were analyzed,and using electrocatalytic reduction as the technical core,combined with characteristics of coal-fired emissions,the selection of the electrochemical system was optimized,and the emission reduction strategies for coal-fired power plants under the background of carbon limitation was put forward. In order to alleviate the increasingly serious problems of CO_2 emission reduction and greenhouse effect,it is the inevitable choice for carbon capture and utilization to transform the large volume of discarded CO_2 into usable products. In this paper,the process principle of CO_2 catalytic reduction technology was briefly clarified,and the electrode,electrolyte,solubility of CO_2 and reactor form were discussed. Combined with the characteristics of electrochemical catalytic reduction technology and the structural characteristics of coal-fired power plants,the electrochemical catalytic reduction conditions of large volume and low concentration CO_2 were filtered,the basic electrochemical system with Cu based gas diffusion electrode-ionic liquid-continuous reactor as the core was determined. Furthermore,the countermeasures for the electrochemical catalytic reduction of CO_2 in the flue gas of coal-fired power plants were proposed. However,in the process of transforming the technology into practical application,the technology still faces obstacles,such as the influence of impurities in non-ideal gas source,slow product generation rate caused by low reduction current density,short electrode life,and difficult separation and purification associated with product diversity,which points out the research direction for the development of application-oriented technology.