Abstract: With the help of software FLUENT,numerically simulate the combustion of hydrocarbon,H2,CO,which are exhaust gas gathering from different points of sintering machine.The simulation is operated on ring cold machine and the high temperature clinker burn out at last.Taking 6 kinds of combination of CH4,CO,H2 as samples,investigate the proper sinter thickness which support the mixture gas completely burn out at 600,500,400 ℃.Research the combustion law under different temperature,mole fraction of each gas and sinter thickness.The research could provide reference for waste heat recovery and exhaust gas reduction during sintering process.