Abstract: In order to study the high temperature oxidation characteristics of ultra-low concentration methane, the high temperature oxidation of five ultra-low concentration methane gases with concentration of 0.5%, 1%, 2%, 3%, 4% was simulated by CHEMKIN software. The variation of pressure, temperature, reactants and resultants after high temperature oxidation was analyzed. The simulation results show that the volume fraction of methane drops sharply with the increase of time. The volume fraction of carbon monoxide produced rises sharply and then drops rapidly to zero. Carbon dioxide volume fraction, temperature and pressure rise sharply and then tend to stabilize. Moreover, temperature, pressure, the final value of carbon dioxide volume fraction and the maximum volume fraction value of carbon monoxide increase with the increase of methane volume fraction.