Abstract: Based on the observation of total solar radiation and other meteorological data in Dunhuang and Jiuquan meteorological station of Jiuquan City, we established the calculation model of total solar radiation climatology to supplement the data vacancy. The variation of total solar radiation over time in Jiuquan was studied by using polynomial and time series analysis. Based on ArcGIS’s geographic information system, the spatial distribution of total solar radiation within the city border was studied and partitioned. The results showed that, light resource in Jiuquan was very rich, the annual total solar radiation was 6000-6450 MJ/m2, only next to the Qinghai-Tibet plateau in China, and had great value for development and utilization. In 1958- 2016, the mean distance of the total annual change of solar radiation was between 3% and 4% , whose amplitude was small. Interannual variation fluctuated with two peak value periods and two valley value periods, and had an increasing trend after 2012. The maximum monthly variation of total solar radiation appeared in June, while the minimum was in December. The highest amount was in summer, followed by spring and autumn, and the lowest was in winter. The spatial distribution of solar radiation gradually diminished from north to south, and could be divided into three areas: Ⅰwas the extremely rich radiation area in the north; Ⅱ was the more rich radiation area in central and Ⅲ was the rich area in the south.