Abstract: Taking Hubei Enshi household biogas project as a case study, greenhouse gas emission reduction potential of installing household biogas digesters was analyzed by using methodologies (AMS-III.R and AMS-I.C) approved by Executive Board (EB) of clean development mechanism (CDM) under United Nation Framework Convention on Climate Change. The project involved in 33 000 households in 8 counties of Enshi Prefecture, a mountainous poor area of Hubei Province, China. The analysis showed that installing biogas digesters could reduce CH4 emission from the manure management by fermenting manure in the biogas digester instead of being stored in a deep pit, and utilize the renewable energy of biogas. It is expected that the installation of biogas digester could reduce GHG emission of 1.43-2.0 t CO2 equivalent for each household. The estimated annual emission reduction for the project will be 58 444 t CO2 equivalent.