Abstract: Based on the national strategy of Carbon Emission Reduction and Carbon Neutral, blowing hydrogen-rich gas into the blast furnace has become an important method for effective emission reduction, in which the research on the blowing of coke oven gas (COG) in the blast furnace has also received wide attention, but there are relatively few researches on the effect of the blowing amount of COG on the smelting process of the blast furnace.On this basis this paper adopts CFD numerical simulation method to explore the influence of COG blowing amount on the factors of pulverised coal combustion rate, gas reduction reaction, coke reaction at the air outlet and soft melting zone in the blast furnace.The results show that with the increase of COG blowing rate, the hydrogen-based reduction path and water gas reaction are strengthened, while the position and shape of the soft melt zone in the furnace are changed. Based on this simulation, the COG blowing rate of 120 Nm3?min-1 is relatively suitable, the thickness of the soft melt zone is reduced and the permeability is improved, and the distribution of gas velocity is relatively uniform.