Abstract: In order to determine the reduction process of ironmaking system under the oxygen blast furnace condition,a mathematical model of coupling gas solid heat transfer with chemical reaction in the blast furnace had been developed and been used to obtain the heating systems and the atmosphere change rules of the oxygen blast furnace and conventional blast furnace at various areas above the blast furnace soft melting zone,The reduction behavior of the pellet under conditions of oxygen blast furnace and conventional blast furnace had been studied through the reduction experiments using the programmed reduction device. Experimental results showed that compared with the conventional blast furnace conditions,pellet reducibility in the area above soft melting zone of ironmaking in the oxygen blast furnace ironmaking had been greatly improved,especially at the edge area above the soft melting zone. Due to the increase of reduction potential and the amount of H₂,the reduction process in the area above the soft melting zone of oxygen blast furnace was quicker than the conventional blast furnace and the amount of metallic iron was larger,thus improving the metallurgical properties of burden of high-temperature in the bottom of blast furnace. The results can provide theoretical foundation for the industrial application of oxygen blast furnace.