Analysis of change in meteorological factors like temperature and precipitation during 1957-2013, the effects of temperature and CO2concentration on winter wheat yield were simulated by AquaCrop model under current rainfall condition in three regions(Yan′an,Changwu and Ankang)of Shaanxi Province.The results showed that the annual temperature increased by 0.1℃,the winter wheat yield in Changwu and Ankang were reduced by 0.3%and 0.7%,respectively,while it increased by 0.5%in Yan′an,when annual CO2concentration increased by 20mumol/mol in Yan′an and Ankang,the winter wheat yield increased by 3.6%and 4.2%,respectively,the annual CO2concentration in Changwu increased by 10mumol/mol,the yield increased by 2.2%;when the annual temperature and CO2concentration rose simultaneously,i.e., temperature rose by 0.1℃,CO2concentration of increased by 20mumol/mol in Yan′an and Ankang,increased by 10mumol/mol in Changwu,the winter wheat yield increased by 4.0%,2.0%and 3.6%in Yan′an,Changwu and Ankang,respectively.Only considering the variation of temperature and CO2concentration,the winter white yield had different preferences because of the variation of regions.Under three typical years(i.e., dry,normal and wet year),the winter wheat yield may be increased by 3.3%~10.3%in Yan′an,2.3%~ 10.0%in Changwu and 1.8%~9.8%in Ankang in the next 18years compared to that in 2012.Therefore, the increases of temperature and CO2concentration,the warm-dry and high-carbon as well as the warm-wet and high-carbon climate patterns were conducive to increasing of the winter wheat yield.The increasing rate decreased in the order:Yan′an>Changwu>Ankang,which indicated that it would be possible to increase the winter wheat planting area moderately in order to increase agricultural output in the northern Shaanxi.