Abstract: Landfill is one of major anthropogenic and reducible methane sources. The characteristic δ13C could be a valuable factor in regional or global inventory estimation of methane. The characteristic δ13C of methane of one typical metropolitan landfill named Asuwei in China was analyzed. The measured δ13C values ranged from-54.9‰～-49.0‰, which indicated common characteristic δ13C of methane from landfills in the world. However, it was revealed that, because of the structural differences in exhaust system between Asuwei and landfills in developed countries as well as the specific condition, the oxidation took place both during the methane emission from the exhaust pipe and from the cover soil, which caused heavier δ13C values in Asuwei than landfills in developed countries and significant oxidized δ13C characteristics there.