On the basis of climate observation monthly data of Shaanxi province collected from twenty-three meteorology stations from 1951 to 2009, the annual average temperature data layer and average relative humidity data layer of Xi′an city were got by using Arcgis technology, Kriging interpolation and mask calculation. Meanwhile, based on the annual average temperature, the division and change of climate suitability were analyzed. The results showed that there existed first common suitable region and second comparatively suitable region from 1951 to 1990 in the study area. From the 1990s, the annual average temperature gradually increased，and the area of partial heat region,that is first comparatively suitable region began to appear and gradually increased, while the area of partial cool gradually decreased by about 28 km2 annually. At this rate, partial cool region will disappear in 9 years, and first comparatively suitable region will be dominant.