Analyzing the impact of climate change on agricultural production is beneficial to develop appropriate strategies and protect food security.In the study,thetrends of meteorological factors in 1957-2013,and the effects of temperature and CO_2 concentration on winter wheat yield were simulated by AquaCrop model in Northern Shaanxi Province.The results showed that the annual temperature in Northern Shaanxi increased at a rate of 0.22℃/10a,while the annual precipitation decreased at a rate of 0.15mm/10ain 1957-2013. With an increase of 0.1℃in the annual temperature,the winter wheat yield in Yulin and Yan'an increased by 1.5% and 0.5%,respectively.When annual CO_2 concentration increased by 10mumol/mol,the winter wheat yield increased by 3.8%and 2%in Yulin and Yan'an,respectively.When the annual temperature and CO_2 concentration rose simultaneously(i.e.,temperature rose by 0.1℃and CO_2 concentration increased by 10mumol/mol),the winter wheat yield increased by 5.1%and 2.3%in Yulin and Yan'an,respectively.Only considering the variation of temperature and CO_2 concentration,the warm-dry and high-carbon climate were beneficial to improve wheat production in Northern Shaanxi.The winter wheat yield would increase at different degrees in the next 18years in Northern Shaanxi region.Under three typical years(i.e.dry,normal and wet year), the winter wheat yield in 2020,2025and 2030in Yulin would increase by 21.2%~31.8%,25.4%~36.0%and 29.7%~40.7%respectively compared to that in 2012,whereas,the wheat yield in Yan'an would increase by 3.3%~8.3%,4.4%~9.7%and 4.8%~10.5%,respectively.Therefore,it is suitable to increase the winter wheat planting area moderately to increase agricultural output in Northern Shaanxi.