Abstract: In order to better develop and utilize the solar energy resources in Xinjiang, with statistics and other methods, the authors analyzed the seasonal variation and regional distribution of solar altitude and solar radiation energy in southern and northern Xinjiang. The results showed that: (1) The continuation time of solar altitude in the same day of the same area were different, the continuation time of sunrise and sunset were less than that of noon; with the increase of latitude, the continuation time of the same solar altitude in different parts gradually increased, that of northern Xinjiang was longer than that of southern Xinjiang; the maximum of solar altitude decreased with the increase of latitude, that of northern Xinjiang was below that of southern Xinjiang. (2) The solar altitude in summer was the highest, while that in winter was the lowest. The maximum variation range of solar altitude of southern Xinjiang was greater than that of northern Xinjiang. (3) The solar radiation in summer was the strongest, while that in winter was the weakest. With the increase of solar radiation intensity, the percentage of continuation time accounted for a greater part of day time. Under the same solar radiation, the continuation time in southern Xinjiang was shorter than that in northern Xinjiang. Understanding the changes of solar altitude and solar radiation energy in Xinjiang could provide a more scientific basis for the development and utilization of solar energy resources in southern and northern Xinjiang.