Abstract:  Based on the daily average temperature and extreme minimum temperature data of sixteen meteorological stations during 1961-2009 in Urumqi city and Changji Hui national autonomous prefecture of Xinjiang (Urumqi Changji region), the fundamental fine spatial temporal change characteristic of various agroclimatic heat elements, such as the mean temperature of annual, January and July, the annual accumulated temperature of ≥0℃ and ≥10℃,〖JP+1〗 frostfree period and the negative accumulated temperature in winter, were analyzed by using the methods of linear regression, Mann Kendall test and three dimensional and quadratic trend surface simulation and inverse distance square weighting residual error revising based on ArcGIS. The main results were as the follows： the agroclimatic heat resource was very obviously different in different regions in Urumqi Changji region. Generally, the average temperature of annual and July were higher, and the annual accumulated temperature of ≥0℃ and ≥10℃ and the frost free period were more in plain and valley than that in mountain areas，and western were more than eastern，but by the influence of winter inversion, January mean temperature was higher and the negative accumulated temperature was less in piedmont sloping plain to hillside central of Tianshan mountain than in northern plains and higher mountain areas in UrumqiChangji region. In the background of global warming, agroclimatic heat resources have a significant increasing in recent 49 years in UrumqiChangji region, generally, the mean temperature of annual, January and July,accumulated temperature of ≥0℃ and ≥10℃, frost free period have a significant increasing trend, and them had the discontinuity increased in 1973 to 2004 respectively, negative accumulated temperature had a significant decreasing trend and it had the discontinuity reduced in 1988. But the change range of before and after various agroclimatic heat elements have discontinuity changed were larger in plain than in mountain areas, and larger in urban than in suburban.

Key words: Urumqi Changji region, Agroclimatic heat resources, Fine spatial temporal change, GIS