Abstract: 【Objective】To study the emission characteristics of soil N₂O and verify the adaptability of the DNDC model to N₂O emission under different fertilization levels on the Loess Plateau of Longzhong.【Method】Wheat fields in Dingxi City,Gansu Province,were set up with no nitrogen fertilizer （0 kg/hm~2）,low nitrogen fertilizer （55 kg/hm~2）,medium nitrogen fertilizer （110 kg/hm~2） and high nitrogen fertilizer（220 kg/hm~2）.Soil N₂O emission flux was measured in situ by static box gas chromatography.Combined with the measured data of N₂O emission flux continuously monitored at the test site,the DNDC model was used to investigate the sensitivity of several factors to simulated N₂O emission.【Result】Under different fertilization levels,the trend of soil N₂O emission was basically the same,and the emission flux was positively correlated with the nitrogen application rate.The DNDC model has a good simulation effect on N₂O emission under four fertilization levels,which is manifested as no nitrogen fertilizer （R~2=0.88,EF=0.84,P=0.002）,low nitrogen fertilizer （R~2=0.92,EF=0.82,P=0.001）,and low nitrogen fertilizer （R~2=0.92,EF=0.82,P=0.001）.Medium nitrogen （R~2=0.86,EF=0.81,P=0.003） and high nitrogen （R~2=0.84,EF=0.74,P=0.004） showed that the DNDC model could be used to simulate soil N₂O emission under different fertilization levels.Sensitivity analysis showed that compared with other factors,soil pH value was the most sensitive parameter to affect N₂O emission from farmland in the study area.【Conclusion】This study can provide the theoretical basis and technical support for local application of the regional N₂O emission model and optimization of farmland management measures.