Abstract: Methane produced by rumen fermentation of ruminants was excreted from mouth by eructation, which reduced the feed utilization rate and aggravated the greenhouse effect. Therefore, it was of important significance for the economy and environment to reduce the yield of methane produced from the rumen of ruminants. The excretion amount of methane from ruminants, the influencing factors of the excretion amount of methane and the kinds of methane inhibitors were mainly reviewed.