Combustion performance of oxygen ethanol and thermal change in combustion reaction process was analyzed. Calculate the theoretical temperature of oxygen ethanol flame by thermodynamic theory. Relationship between the combustion temperature and the reactant was  confirmed,so oxygen ethanol flame can be used in metal oxygen cutting. Feasibility of this method was proofed in further by cutting test and compare with oxygen acetylene. The results show that using appropriate technology in cutting conditions, the quality of slot may meet needs.