Abstract: By using closed-chamber technique, the characteristics of CH₄ emission from an integrated rice-duck ecosystem were studied in 2006 and 2007. The results showed that comparing with conventional flooded rice ecosystem (CK), integrated rice-duck system (RD) was distinguished in its high dissolved oxygen (DO) in field surface water and significantly lower CH₄ emission, due to the activities of duck. In 2006, the average CH₄ emission flux and the total CH₄ emission during the whole rice growth period of RD were 6.84±1.49mg·m^-2·h^-1 and 19.34±1.15 g·m^-2, being 32.7% and 26.3% lower than those of CK (10.17±1.25 mg·m^-2·h^-1 and 26.25±2.17 g·m^-2), respectively; while in 2007, the values of the two test items of RD were 7.68±0.74 mg·m^-2·h^-1 and 18.41±1.05 g·m^-2, being 19.0% and 19.3% lower than those of CK (9.53±0.40 mg·m^-2·h^-1 and 22.81±0.75 g·m^-2), respectively. The emission flux of CH₄ had two peaks, being appeared at tillering and heading stages, respectively. The seasonal fluctuations of CH₄ emission flux had significant positive correlations with soil temperature and soil dissolved organic carbon content (DOC), but no obvious correlation with soil total organic carbon.