A novel combustion method used in boiler chemical-looping combustion（CLC） is introduced, which can simultaneously realize high-efficiency power generation and low-energy CO2 separation. Thermogravimetric analysis (TGA) was carried out in methane atmosphere, with iron ore from Xuzhou Liguo Iron Mine as the oxygen carrier, as well as the chemical kinetics was analyzed based on TGA curves. The results show that temperature is the key factor to the reduction of iron-based oxygen carrier, in which the reduction rate becomes faster and the reduction degree becomes deeper with the increase of temperature. In addition, the Valensi model between 450-700 ℃ and the contractive sphere model between 850-1　050 ℃ are most suitable for the reduction of the iron-based oxygen carrier, and the kinetic parameters including activation energy and pre-exponential factor are calculated according to the kinetic model respectively. The research results can provide theoretical guidance for CLC applied in electric power industry.