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Ionization of gas on carbothermic reduction of metal oxides containing coal by microwave heating is studied in the paper. The result of using the conventional heating method to conduct the carbothermic reduction of metal oxides containing coal is obviously weaker than that of the microwave heating in the term of the reduction time, temperature, atom mole ratio of carbon and oxygen. After studied on the cause, it is believed that gas is ionized in carbothermic reduction of solid-solid phrase between metal oxides and coals, which accelerates progress of carbon gasification and significantly improves kinetic conditions of carbothermic reduction.