Abstract: In order to study the influence of multi-component gas on methane explosion, the representative combustible gases CH₄, C₂H₆, C₂H₄, CO and H₂ were selected, and the CHEMKIN software was used to simulate and analyze the reaction process of C₂H₆/C₂H₄/CO/H₂ gas explosion. The results show that: with the increase of the volume fraction of each combustible gas in the mixture, the explosion pressure and temperature of methane continue to increase, the volume fraction of methane and oxygen decrease rapidly, and the ignition extension time shortens obviously; among the toxic and harmful gases produced by explosion, the volume fraction of CO is the highest; the volume fraction of H^* and OH^* radicals continues to increase, while the volume fraction of O^* radicals first increases and then decreases. Sensitivity analysis finds that the main reaction steps that promote free radical formation are R38: H+O₂ \rightleftharpoons O+OH and R119: HO₂+CH₃ \rightleftharpoons OH+CH₃O, while R98:OH+CH₄ \rightleftharpoons CH₃+H₂O and R53:H+CH₄ \rightleftharpoons CH₃+H₂ are the main reaction steps that inhibit free radical formation.