Abstract: Rice paddy soil has oxic-anoxic interfaces where methane consumption and ammonia oxidation might happen simultaneously.Due to similarity of enzyme-catalyzing methane consumption to ammonia oxidation,methane produced within paddy soil could affect ammonia oxidation while methane oxidation will probably be significantly influenced by variation of ammonia concentration induced by the application of ammonia-based fertilizers.The relationship of methane consumption to ammonia oxidation in rice paddy soils is reviewed here.