Abstract: This paper simulates variation laws of CH₄ explosion peak pressure in different atmospheres (gas concentration, the ignition energy and initial pressure) based on the fluent software. The results show that the maximum explosion peak pressure enhances 22% in 6% methane concentration and drops 25% in 12% methane concentration with the adding of CO; it increases 55% in 6% methane concentration and reduces 64% in 12% methane concentration with the mixing of C₂H₆; it increases 22% in 6% methane concentration and drops 5% in 12% methane concentration with the joining of H₂, it enhances 31% in 9% methane concentration when the ignition energy adds from 1 J to 10 J, and it improves 24% in 9.5% methane concentration when the environment pressure rises from 101 325 to 1.5×101 325 Pa.