Methane (CH_4) and carbon dioxide (CO_2) emissions from winter paddy fields are believed to produce great influence on greenhouses gas emissions from paddy field. Thus, it is necessary to explore suitable winter cover crops for reducing CH_4 and CO_2 emissions from paddy filed. Static chamber technique was employed to observe CH_4 and CO_2 emissions under three different treatments (tillage and directly sowing rape, YC; tillage and directly sowing winter wheat, XM; fallow was set as control, CK). Effects of different winter cover crops on emissions of CH_4 and CO_2 from paddy filed were analyzed during growth period. The results showed that CH_4 emission flux decreased in order of YC>XM>CK; instead, CO_2 emission flux decreased in order of XM>YC>CK. At the same time, cumulative emissions of CH_4 and CO_2 were observed keeping at the same decreased trends with their emission flux, respectively. CH_4 emission in YC treatments was significantly higher than that in CK(P<0.05), However, CO_2 cumulative emission in YC treatment was significantly lower than XM and CK(P<0.05).Global warming potential (GWP)(Calculated as the CO_2-equivalents on the scale over 100 years) from CH_4 and CO_2 emissions in different treatments was decreased in order of XM>YC>CK; XM treatment had the largest GWP, with a value of 6442.58 (kg·hm~(-2)). Abovementioned results revealed that XM treatment had the largest total greenhouse effect; however, CK treatment had lowest total greenhouse effect when compared with XM and YC treatment. Object of this study is to seek a reasonable using way for winter paddy field, and expect to provide theoretical basis for effective control of greenhouse gas emissions from paddy field.