Abstract: In order to increase the reaction activity of the Caso₄ aerobic oxygen, we respectively prepared two oxidant of CuO+CasO₄ and MnO₂+CasO₄ by mechanical mixing and impregnation method. The method and quantity of adding CuO and MnO₂ to the CaSO₄ oxygen carrier were changed, and a thermogravimetric analyzer was used to carry out the chemical chain combustion experiment of the two composite oxygen carriers and CO. We analyzed the composition of the samples before and after the reaction by field emission scanning electron microscope and X-ray energy spectrum and characterized the appearance. We found that the reactivity of the oxygen carriers prepared by the impregnation method and the mechanical mixing method were both improved, but the former was better than the latter. When the addition amount of CuO and MnO₂ were 5 mol% and 10 mol%, the optimum performance is the best. Comparing with the same addition amount, the reaction activity of CuO+CaSO₄ oxygen carrier is higher, and the reaction activity of MnO₂+CaSO₄ oxygen carrier is very high in the initial stage of the reaction, and then decreases faster. The CuO+CaSO₄ oxygen carrier is more conducive in improving the performance of chemical looping combustion.