Abstract: In order to find out the mutual transformation relationship of soil oxidizable organic carbon fraction and its relationship with methane emission, an incubation experiment was designed to monitor the dynamic of methane emission, analysis the oxidizable organic carbon fraction using potassium permanganate (KMnO4) procedure and study the dynamic relevance of methane emission and oxidizable organic carbon fraction after applications of pig manure, chicken manure and rice straw in flooded paddy soil. The results showed that, soil methane accumulation emission fluxes increased significantly after applications of exogenous organic carbon. methane accumulation emission fluxes of the treatment of soil + rice straw (178.8kg/hm2) was 265.2% (P<0.01) highly than that of the treatment of single soil. The treatment of soil + chicken manure and soil + pig manure respectively increased 127.3% (P<0.01) and 95.3% (P<0.01). After applications of exogenous organic carbon, the content of soil oxidizable organic carbon (AOC3.33、AOC16.7-3.33、AOC33-16.7and AOC167-33) also increased. Besides, AOC3.33and AOC16.7-3.33as high-activity soil organic carbon had a strong correlation, and respectively had extremely significant correlations with methane emission fluxes(P<0.01). AOC33-16.7had no correlation with other active organic carbon fraction and methane emission fluxes, as well as AOC167-33. The conclusions indicate that soil oxidizable organic carbon AOC3.33and AOC16.7-3.33significantly influence methane emission from flooded paddy soil.