How to reduce the emissions of greenhouse gas from farmlands while ensuring grain yield increase is the top priority for China to cope with global climate change.To explore the multifactor effect of nitrogen fertilizer on N_2O emission and the yield of potato field,and verify the applicability of DNDC to N_2O emission and yield prediction,we selected the potato field under the normal rainfall condition in Shenyang as the experiment site.The experiment has four nitrogen levels:no-nitrogen,low-nitrogen (75 kg·hm~(-2)),middle-nitrogen (150 kg·hm~(-2)) and high-nitrogen (225 kg·hm~(-2)).The static chamber/gas chromatograph technique was used to observe soil N_2O emission and DNDC model was used to explore the multifactor effect on N_2O emission and yield of potato field.The results are as follows:(1) DNDC has a good simulation effect on N_2O emission and yield.Model efficiency indexes EFs are 0.45-0.76,0.41-0.73 in 2017 and 2018,respectively.In 2017,the simulation of yield:EF=0.91,R~2=0.97,P=0.017.In 2018,EF=0.85,R~2=0.95,P=0.027.(2) Annual precipitation,soil organic carbon,soil volume-weight and pH has significant influences on accumulated N_2O emission during the growth period of potato,and there are positive correlations between those factors and the emission.Annual precipitation,annual average temperature,CO_2 mass concentration and nitrogen application levels has significant influences on yield.Annual average temperature is negatively correlated with yield,and the other three factors are positively correlated with yield.And (3) under the premise of normal water supply,sowing potatoes within 5 days after the 5-day sliding average temperature in this area exceeding 10 ℃ can ensure the temperature demand of normal growth of potatoes and achieve the purpose of maintaining and increasing yield.