One of the most important sources of methane is from ruminants gut.Reducing gut methane emission is significant to mitigate climate warming and improve feed utilization.Ruminants gut methane is mainly from microbe's fermentation in the rumen.This paper reviewed types of rumen methanogens, synthesis processes of methane and new nutritional regulation technologies for reducing gut methane emission, looking forward to provide references for further studies on development of methane emission reduction measures.