Abstract: Photothermal catalysis is a promising strategy for CO_2 reduction,which can use the broad absorption of solar spectrum to stimulate the combination of thermochemical and photochemical processes,so as to promote the catalytic reaction and realize the efficient conversion of CO_2 under mild conditions. As a kind of photothermal catalysis,the introduction of heat energy into photocatalysis can improve the utilization of sunlight,promote the excitation and separation of carriers,and accelerate the diffusion of reaction molecules,and improve the reverse lift performance. In this paper,the concept and principle of photocatalytic CO_2 reduction were classified,and the research status of thermally assisted photocatalytic reduction of CO_2 was summarized. Based on the difference of reaction products,the selection of catalyst,reaction conditions and reaction mechanism of thermally assisted photocatalytic reaction were introduced. In addition,the key technology of local temperature measurement in photothermal reaction experiment was also introduced. Finally,the development of photocatalytic CO_2 reduction technology was prospected. The focus of future research should improve CO_2 conversion and product selectivity,and explore the reaction mechanism by using advanced in-situ characterization technology and theoretical calculation.