With the aim of studying the effect of paddy fields incorporating Chinese milk vetch on CH_4 and N_2O emissions, a static closedchamber gas chromatography method was employed to measure CH_4 and N_2O emission fluxes, global warming potential(GWP), and greenhouse gas emissions intensity(GHGI)of southern double-cropped paddy fields in China under four different treatments. The treatments were fallow, double-cropped paddy field without nitrogen application(CK); fallow with 200 kg·hm~(-2) nitrogen application in the first and second rice growing seasons(N_(200)); winter planting with Chinese milk vetch incorporation without nitrogen application(CMV); and winter planting with half Chinese milk vetch incorporation with 100 kg·hm~(-2) nitrogen application in the first and second rice growing seasons (CMV+N_(100)). The results indicated that the CH_4 emission peaks with the four treatments mainly occurred from the early rice transplanting stage to the tilling end stage and CMV+N_(100)(52.94 mg·m~(-2)·h~(-1))and CMV(105.6 mg·m~(-2)·h~(-1))had peak CH_4 emission values, respectively, in the early rice and late rice stages. N_2O emission peaks occurred in the early transplanting, tilling, and dry-wet alternation stages of the paddy fields, with the N_(200) N_2O emission peaking both in the early and late rice stages, respectively, at 717.7 mug·m~(-2)·h~(-1) and 1 065.57 mug·m~(-2)·h~(-1). CMV+N_(100) increased the cumulative emissions of CH_4, yet reduced N_2O emissions, when compared with N_(200), and CH_4 emissions during the early rice season were lower than those during the late rice season. At the same time, our results suggested that compared with CK, fertilization had no significant influence on the GWP of the paddy fields, and the contribution of CH_4 to GWP was more than 90%. Compared with N_(200), CMV+N_(100) increased the GHGI of early rice but decreased the GHGI of late rice. However, no significant influence on the GHGI of double-cropped rice was observed. In conclusion, although Chinese milk vetch residue incorporation in paddy fields with nitrogen application increased CH_4 emissions from the paddy fields, it reduced N_2O emissions and the GHGI of the late rice season under direct seeding conditions.