Abstract: As one of the largest sources of industrial carbon dioxide emissions, the iron and steel industry has become an important field for China to achieve the goal of "double carbon". Therefore, on the basis of integrating low-carbon technologies at home and abroad, a preliminary list of low-carbon technologies in the iron and steel industry has been formed. Through Delphi method and analytic hierarchy process, the index system of low-carbon technology evaluation of iron and steel enterprises is established, the weight of each index is determined, and the low-carbon technology evaluation method of iron and steel enterprises is formed. Finally, the applied low-carbon technologies of four Hunan Iron and steel enterprises are evaluated to reveal the priority of emission reduction of each technology, so as to provide support for technology selection of iron and steel enterprises. The results show that the scores of TRT and scrap recycling technology are high, which are 83.129 and 82.982 respectively; The scores of intelligent steelmaking technology and comprehensive utilization of gaseous secondary energy rich in carbon monoxide are low, 74.040 and 72.991 respectively; The technology at the medium level basically belongs to energy-saving technologies such as waste heat and residual pressure utilization. From the perspective of short-term objectives, the effective carbon reduction technology path for the iron and steel industry to achieve carbon peak includes accelerating the popularization and promotion of mature energy-saving technologies such as waste heat and residual pressure utilization, and increasing the proportion of self generated power; Increase scrap ratio; Realize the intellectualization of iron and steel enterprises. From the perspective of long-term goal, in order to realize the technical path of carbon neutralization in the iron and steel industry, we must change the energy structure of the iron and steel industry and encourage the research and development of raw material substitution technology; Vigorously develop carbon storage technologies to achieve deep decarbonization in the iron and steel industry.