Reducing the N2O produced by nitrogen application plays an important role in global N2O emission reduction.Taking the summer maize in North China plain,Shandong province as the object,a continuous observation of N2O emissions from four fertilization treatments（FP:farmers practice,ND:nitrogen drilling,CRF:controlled release nitrogen fertilizer,LD:single layered fertilization)was conducted by using the static chamberGC（gas chromatographic)method,the maize yield and emission reduction cost were also monitored simultaneously.The results indicated that the “pulse” emissions of N2O were measured following the event of fertilization and irrigation,and lasted 3～5 days.Compared with FP,the treatments ND,CRF and LD significantly reduced the emission peak of N2O and decreased the total N2O emission by 12.6%～18.9%.The sequencing of emission reduction effect was LD > CRF >ND.Both N2O emission reduction and maize yield growth were found in ND,CRF and LD,but the slightly income increasing only found in CRF and LD treatments,due to the increase in labor costs.Compared with the FP,the N emission intensity per unit yield and the N emission intensity per unit net income were reduced.The cost of 1 kg CO2eq emission reduction were reduced by 0.97 yuan in CRF treatment,but increased by 4.83 yuan and 3.23 yuan in the treatments ND and LD,respectively under the conditions of this experiment.The mitigation cost was reduced by 2 yuan in LD treatment for the production machinery used in fertilization.On the whole,the application of controlled release fertilizer is the best nitrogen management measure for reducing N2O emission and increasing maize yield and efficiency under no supporting fertilization machinery;On the other hand,single layered fertilization can also be chosen.