Using the CO₂ flux data obtained by the eddy covariance method in the northeast of the Qinghai-Tibetan Plateau in 2005, we analyzed the carbon dynamics in relation to the meteorological factors. The results showed that the alpine wetland ecosystem was a carbon source, and emitted 316.02gCO₂•m^-2 to the atmosphere in 2005 with 230.16 gCO₂•m^-2 absorbed in the growing season from May to September and 546.18 gCO₂•m-2 released in the non-growing season from January to April and from October to December. The maximum of the averaged daily CO₂ uptake rates and release rates was (0.45±0.0012) mgCO₂•m^-2•s^-1(Mean SE) in July, and (0.22±0.0090) mgCO₂•m^-2•s^-1 in August respectively. The averaged diurnal variation showed a single-peaked pattern in the growing season but exhibited very small fluctuation in the non-growing season. Net ecosystem exchange (NEE) and gross primary production (GPP) were all correlated with some meteorological factors, and showed a negative linear correlation with aboveground biomass, while a positive correlation existed between the ecosystem respiration (Res）and those factors