The methane oxidation within the temperature range of 850-1 300 K and atmospheric pressure was studied in a jet stirred reactor. The major reactants (CH4

O2)

intermediate components (C2H6

C2H4

C2H2

H) and pollutants (CO

CO2) were measured by gas chromatography under the condition of equivalence ratio range of 02-2

oxygen content of 2%-8%

carbon dioxide content of 0-20%

water vapor content of 0-20%. The effects of various compositions on species distributions during methane oxidation were analyzed in detail. It was found that the concentration of intermediate components increased with the increase of equivalence ratio and oxygen content; the increase of carbon dioxide content had a weak inhibitory effect on the formation of intermediate products

but resulted in obvious rise of the concentration of pollutants; the increase of water vapor content led to significant increase of hydrogen production

and promoted the formation of carbon monoxide

but had little effect on the formation of carbon dioxide.