Abstract:The directly emitted CO2 for per ton of hot-rolled steel products in the full process route of a project is 1.786 t which is calculated from the carbon flow of each process. With this value as basis, a quantitative evaluation is made on the carbon reduction result of several major carbon reduction technologies in the BF-BOF long process route, and the result revealed that the technologies can function only as a transition approach or a supplement to the final solution in the evolution course from "peak emission" to "carbon neutrality" due to their limited carbon reduction etfect. Viewing from the perspective of "carbon neutrality" requirements, the short process route of EAF with 100% scrap or gas-based DRI + scrap as raw materials, assuredly, is the best solution. An applicability analysis on portfolio solution of several typical short process routes which in consideration of China's resource conditions is made, and an all-round solution is proposed, which is underlaid by “H2-based shaft furnace DRI + EAF steelmaking” and supplemented by “BF-BOF long process CO2 reduction technology + CCS route” and “100% scrap EAF steelmaking route”. A solution of obtaining the "green H2" required for H2-based shaft furnace DRI production is also suggested.