Abstract: A pot experiment in greenhouse was carried out to study seasonal variations of CH₄ fluxes from rice paddy soils and the effect of land management in winter crop season on the seasonal variations. The results showed that four emission peaks occurred respectively 13 days after flooding and 7, 40, 91 days after rice transplanting, and CH₄ emission amounts during the first 30 days after flooding accounted for as high as 67.5%, 35.5% and 33.3% of the total emission amounts during the observing period of 133days for treatments with dry fallow but rice straw being applied just before flooding, alfalfa, and flooded fallow in winter crop season. However, for treatments with dry fallow but rice straw being applied before winter crop cultivating and winter wheat in winter crop season, CH₄ emission amounts during the first 50 days after flooding just accounted for 0.27% and 6.74 of the total emission amounts during the observing period, and CH₄ fluxes thereafter were also very small. Difference in the seasonal variation patterns of soil Eh due to land management in winter crop season was the main reason why seasonal variation patterns of CH₄ fluxes from different treatments were different.