Abstract: This paper studies on the coupled reaction of coke gasification-iron ore reduction in majors of iron and steel corporation in China, simulating the behaviour of blast furnace dependenting on gas composition and gas temperature. It was found that the reaction charateristics of the coke gasification-iron ore reduction were markly affected by its history. The efficiency of blast furnace should consider the imbalance between CO produced by coke gasification and CO consumed by iron ore reduction.