A field experiment was conducted to investigate the effects of straw returning with different application ratios of nitrogen [3∶1∶3∶3(N1),5∶1∶2∶2(N_2),7∶1∶2∶0(N3)] and no straw returning with 5∶1∶2∶2 nitrogen application ratio(N4) on the emissions of CH_4,CO_2 and N_2O. Combined with the yield,greenhouse gas intensity(GHGI) and global warming potential(GWP) were estimated. Gas fluxes were analyzed using the static opaque chamber gas chromato-graphy method. Compared with no straw returning,rice straw returning significantly increased the emissions of CO_2 and CH_4,but decreased N_2O emission,and increased GWP during wheat growing season. No significant difference was noted between the cumulative emissions of CH_4 and CO_2 and GWP under different nitrogen application ratios. However,the N3 treatment significantly increased the cumulative emission of N_2O,with an increase of 61.22% and 51.92%,compared with N1 and N_2. The GHGI of N1 and N_2 was decreased by 41.27% and 39.67%,compared with N4. The GHGI of N3 was 3.30% higher than that of N4. Our study indicated that the nitrogen application ratios of 3∶1∶3∶3 and 5∶1∶2∶2 had significant effects on reducing greenhouse gas emission and could be used as an effective way of low carbon production of wheat.