In order to reasonably and elaborately simulate the solar total radiation on the ground, based on the digital elevation model (DEM), total cloud amount of FY-2G satellite and the cloud amount, sunshine, radiation data from weather stations, and combined the distributed theoretical model of astronomical radiation and climatology empirical model of total radiation, the integrated remote sensing model of solar total radiation was established. And taking Xinjiang with sparse weather stations as an example, the annual and seasonal solar total radiation was simulated and tested. The results are as follows: (1) The annual total astronomical radiation decreased from south to north in Xinjiang, the annual total astronomical radiation was greater than 10 000 MJ·m-2 in the south of Tianshan Mountain and was less than 9750 MJ·m-2 in the north of Tianshan Mountain, and the influence of mountain topography on astronomical radiation was very obvious. (2) The mean absolute error of sunshine percentage in Xinjiang was 14.4% between the observation and simulation of sunshine percentage model based on total cloud amount from FY-2G satellite with the resampling scheme, and the spatial distribution of the simulated results was more objective. (3) The correlation coefficients in the climatology estimation model of solar total radiation with ‘single station and single month’ were higher in summer half year (from April to September), while that decreased slightly in winter half year, and the complementary relationship was steadier between a and b coefficients. (4) The test results show that the effect of simulation on solar total radiation in summer half year was better than that in winter half year, and in the south of Xinjiang it was better than that in the north, and the average annual root mean square error in the whole region was 3.08 MJ·m-2, the error in Urumqi was the maximum. (5) The annual solar total radiation increased from northwest to southeast in Xinjiang, and that in the basin of southern Xinjiang was higher than that in the basin of northern Xinjiang, the low value center located in the west of Tianshan Mountains. The solar total radiation increased gradually from west to east in Xinjiang in spring and summer, while that appeared the latitudinal distribution in autumn and winter.