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The effects of plasma-assisted ignition and combustion on the ignition-delay time (T_id) and intermediates in methanol combustion were simulated numerically through a chemical-kinetics mechanism of methanol oxidation. Plasma-assisted ignition can considerably shorten the T_id. Plasma-assisted ignition is more conducive to a low temperature and the lean combustion of a methanol-air mixture. According to the shortest T_id, the active particle order is: O < CH₃O < 220 Td < H < OH < CH₂OH < CH₃ < autoignition. The concentration of O atoms in active particles affects the T_id shortening. Plasma-assisted combustion can significantly shorten the time for the system temperature to reach a maximum. The concentrations of the reactants CH₃OH and O₂ decrease sharply for autoignition after the ignition-delay period, and the products CO, CO₂ and H₂O increase rapidly. In plasma-assisted combustion, the addition of …