Abstract: In many temperatezone ecosystems,seasonal changes in environmental and biological factors influence the dynamics and magnitude of soil surfaceatmosphere exchange.Research was conducted to measure soilsurface fluxes of CO2 in Deyeuxia angustifolia dominated wetland during the growing seasons in the Sanjiang Plain of Northeast China.Data were collected between July and October 2001.Soilsurface CO2 fluxes were measured with a closedchamber system.This study was carried out to find out the seasonal fluctuation and daily change in soilsurface CO2 fluxes from Deyeuxia angustifolia wetlands as well as to investigate the edaphic factors controlling the CO2 fluxes.The results revealed that there were both seasonal fluctuations and daily change in CO2 fluxes.The ranges of measured soilsurface CO2 flux were 0.208～1.265 g/(m2·h).Soilsurface CO2 fluxes were 0.619 g/(m2·h)in average level.Study of several edaphic factors like soil temperature and soil moisture of Deyeuxia angustifolia wetland showed that the fluxtemperature relationships are evident exponent correlation(the correlation coefficient is 0.769 9).