Five reservoirs located in the Jiangxi Province(Zhelin, Baiyunshan,Doushui, Hongmen and Xiannühu Reservoirs) were sampled in order to estimate the concentrations of greenhouse gas(GHG) in the surface of these reservoirs. The calculation for diffusive fluxes of nitrous oxide(N₂O), methane(CH₄) and carbon dioxide(CO₂) at the water-air interface indicated that the surface of the reservoirs was a source of N₂O and CH₄ during the sampling period(from 0.29 to 1.05, 3.65 to 39.42 μg/(m²·h), respectively). Zhelin Reservoir(-51.56 μg/(m²·h)) and Xiannühu Reservoir(-589.50 μg/(m²·h)) surfaces constituted sinks for CO₂. In contrast, the surface of all the other reservoirs were sources of CO₂ (from 342.53 to 1383.21 μg/(m²·h)). A significant correlation was observed between the magnitude of N₂O diffusive fluxes and the TN. Water temperature, transparency and TP should affect the CH₄ fluxes. There was no relationship between the CO₂ emission and other environmental factors. Taking into account the global warming potential of N₂O and CH₄, the total fluxs of CO₂ equivalents (TF_eq-CO2) was estimated that ranged from 237.83-2267.83 μg CO₂-e/(m²·h).The contribution of N₂O, CH₄ and CO₂ to TF_eq-CO2 range from 13.94% to 83.26%, 20.54% to 175.21% and from -140.43% to 60.99%, respectively.The contribution of N₂O to TF_eq-CO2 were similar to that of CH₄ in all reservoirs. For Zhelin and Xiannühu Reservoirs, the contribution of CO₂ to TF_eq-CO2 was negative, but it was the most significant in the other reservoirs. The TF_eq-CO2 from each reservoir were equivalent to the 10.52-377.10 t C/a of the carbon emissiom that were much lower than the annual CO₂ emissions from themal power plants burning coal(from 0.05% to 1.12%).