With the increasingly perfecting of carbon pricing mechanisms in iron and steel industry, the economicevaluation of blast furnace ironmaking is changing from a single focus on "production costs" to a combined consideration ofproduction costs + carbon tax costs". In this paper,through focusing on the carbon emission and carbon tax economics ofblast fumaces after the pellet ratio is increased, a model including material-energy flow, carbon emission, and economioanalysis of the ironmaking system is built to analyze the impact of changes in pellet ratio on energy consumption, carbonemission and cost structure. The results show that when the pellet ratio increases from 20% to 80% , the CO₂ emission perton of iron decreases by 12. 46%. Under different carbon price scenarios.the total cost of ironmaking shows characteristicsof differential change with the pellet ratio changing. As carbon prices rise, the emission reduction benefits of high pelletratio can be converted into economic advantages,it is proposed that the concept of "carbon tax reversal point" can be usedas an important economic criterion for optimizing the burden structure of blast furnaces.