The time evolution of the methane reburn process at high temperature was investigated by the simulation method. The simulated results show that the time evolutions of each component are different with the stoichiometric ratio (SR) of the reburn zone and the reaction time. In the simulation conditions, CH4, C2H2, and H appear as SR is from 0.66 to 0.96; CH3 appears as SR is from 0.66 to 0.76; HCN, NH3, and HNCO appear as SR is from 0.66 to 0.86; OH appears as SR is from 0.82 to 0.96. In the case with SR of 0.76, C2H2 and CH3 only appear in the initial 0.2 s, NH3 and HNCO appear in the whole 2.0 s; In the case with SR of 0.82, C2H2 also appears in the initial 0.2 s, NH3 and HNCO only appear in initial 0.5 s, CH3 does not appear in the whole reaction time of 2.0 s. The reaction between CH3 and NO mainly occurs in the strong reducing atmosphere, and contributes significantly to remove NO to HCN, NH3, and HNCO. The interactions of NO with H and OH radicals mainly occur in the weak reducing atmosphere, and contribute to remove a small part of NO to N2. Through comparing the time evolutions of total fixed nitrogen (TFN) with different SR, it is suggested that the optimum SR for reducing TFN in the methane reburn process is about 0.82. Copyright © 2011 Curtin University of Technology and John Wiley & Sons, Ltd.