Methane (CH₄) and nitrous oxide (N₂O) are two important trace gases, which are considered to have 15-30 and 150-200 times more radioactively active than CO₂, respectively. It is well known that agricultural soils are the major sources of atmospheric CH₄ and N₂O. IPCC (2007) revealed that global warming potentials (GWPs) of CH₄ and N₂O are different. Previous researches have investigated some factors that affect the rates of CH₄ and N₂O emission fluxes, such as soil properties, climate, water regime, organic matter incorporation and plant physiology. However, the effects of different winter covering crops cultivation on CH₄ and N₂O emission fluxes from double-cropping paddy fields is unclear. So the quantitative and possible mechanisms dependence of CH₄ and N₂O emission fluxes from double-cropping paddy fields on different winter covering crops cultivation is still far from being understood. Hence, the static chamber-gas chromatography (GC) technique with manual method was chosen to identify the effects of different winter covering crops cultivation (including no-tillage ryegrass and double rice cropping (T₁), no-tillage Chinese milk vetch and double rice cropping (T₂), tillage rape and double rice cropping (T₃), no-tillage rape and double rice cropping (T₄) and fallow and double rice cropping (CK) ) on CH₄ and N₂O emission fluxes from double-cropping paddy fields in subtropical regions of China (28°08'18″ N,113°12'0″ E). The results showed that the fluxes and emission of CH₄ and N₂O was varied with different winter covering crops cultivation patterns, and generally followed the series T₃＞T₁＞T₄＞T₂＞CK, and ANOVA revealed that the emission fluxes of CH₄ and N₂O were significantly (P<0.01) more from the four treatments during the whole growth stage than that of fallow and double rice cropping (CK). In addition, 2.284, 1.073, 2.989, 1.731 and 0.668 g/m² CH₄ emission fluxes were observed from the treatment of T₁, T₂, T₃, T₄ and CK during the whole growth stage of winter covering crops, respectively. CH₄ emissions during the whole growth stage under T₁, T₂, T₃ and T₄ treatments were increased by 241.92%, 60.63%, 347.46% and 159.13%, respectively. Similarly, the treatments of T₁, T₂, T₃, T₄ and CK had also the N₂O emission during the winter covering crops whole growth stage with 0.588, 0.479, 0.719, 0.544 and 0.342 g/m², respectively. N₂O emissions during the whole growth stage under T₁, T₂, T₃ and T₄ treatments were increased by 71.93%, 40.06%, 110.23% and 59.06%, respectively. The treatments of T₃, T₁ had not only the largest CH₄ emissions during the winter covering crops whole growth stage with 2.989 and 2.284 g/m², but also the largest N₂O emissions with 0.719 and 0.588 g/m² from double-cropping paddy fields, respectively. Our study also indicated that GWPs of CH₄ and N₂O from double-cropping paddy fields was varied with different winter covering crops and followed the general series T₃＞T₁＞T₄＞T₂＞CK. The treatment of T₃ also had the largest GWPs of CH₄ and N₂O from double-cropping paddy fields with 2893.92 kg CO₂/hm², while T₁ and T₄ had the secondly GWPs of CH₄ and N₂O from double-cropping paddy fields with 2326.49 and 2056.75 kg CO₂/hm², and the T₂ had the lowest GWPs of CH₄ and N₂O from double-cropping paddy fields with 1698.05 kg CO₂ /hm², respectively. Our results clearly demonstrate that CH₄ and N₂O emission from double-cropping paddy fields were significantly promoted by planting different winter covering crops in double paddy field ecosystem. Further studies investigating the regulated factors of CH₄ and N₂O emissions from double-cropping paddy fields is therefore warranted.