The effects of nitrogen fertilizer management on carbon sequestration and ammonia volatilization of maize under full film covered with double ridge sowing were studied based on the long-term test set up in 2012 at the loess plateau rainfed farming area. The experimentadopted the split plot design.The main treatments in the study included different nitrogen rates:no fertilization as control(N0)，low nitrogen level at 100 kg·hm -2(N1)，medium nitrogen level at 200 kg·hm -2(N2)，and high nitrogen level at 300 kg·hm -2(N3).The subplot treatments were about the period and proportion of fertilization with basefertilizer:jointing fertilizer=1 ∶2(T1)and basefertilizer:jointingfertilizer:belling fertilizer=1 ∶1∶1(T2).The results showedthat:The application of 200 kg·hm -2 nitrogen fertilizer with theratio of basalfertilizer:jointing fertilizer =1 ∶2 significantly improved the grain yield and biomass ofmaize，which increased by 197% and131% compared with thecontrol，respectively.NPFP and NAE were 48% and 47% lower than those with high nitrogen level.Ammoniavolatilization emissions were mainly concentrated in the first week after the application of fertilizer.NH 3 volatilization rate increased rapidlyafter fertilizer applyed inholes，and reached the highest within 1～4days，then graduallydecreased，and finally tended to be samelevel with the control.Moreover，the higher the nitrogen levelwas，the higher the emission peak was.The volatile quantity of NH 3 athigh，medium and low nitrogen application levels increased by6.5，5.9 and 5.4 times compared with the control group without nitrogenapplication，T1 treatment significantly decreased by 37% compared with T2 treatment.N3T2 had the highest volatilization of NH 3，whichwas significantly increased by 13%～ 47% compared with other treatments.The volatilization loss rate of NH 3rangeed from 13% to60%，which gradually decreased with the increase of nitrogen application level.The nitrogen application levels of high and medium nitrogen were 59.6% and 44.6% lower than those of low nitrogen application level. Compared withT2，the NH 3 volatilization loss rate of T1 treatment wassignificantly reduced by40.4%，and the NH 3 volatilization loss was potentially increased by increasing nitrogen application level and timesof fertilizer application.Inconclusion，when planting maize under full film covered with double ridge sowing in the rain -fed farming area ofthe loessplateau，the suitable fertilization system for improving grain yield and capacity of carbon sequestration and emission reduction is asfollows:Nitrogen level is 200 kg·hm -2，and all fertilizers are applied according to the ratio of base fertilizer to jointing fertilizer =1∶2.