Abstract: A method for improving combustion efficiency as combusting a pure substance is disclosed. The method is started from deciding an environmental temperature of a combustion environment, setting a first temperature higher than the environmental temperature, and uniformly heating the pure substance to the first temperature so as to shorten the temperature drop between the outer surface and the inner portion of the pure substance as far as possible. Simultaneously, after a combustion-supporting gas is provided and heated to a second temperature and the combustion-supporting gas is supplied to the combustion environment, the pure substance is ignited. The steps described above can accelerate the temperature raising as combusting the pure substance, so as to be more close to complete combustion, thereby improving efficiency and reducing contaminant production.