Abstract: Due to the influence of slope, aspect and terrain shielding, the continuous distribution of solar radiation received by the mountain surface is difficult to measure, and the estimation of solar radiation on the mountain surface has become a focus of current research. In order to analyze the solar radiation on the mountain surface quantitatively, Landsat8, DEM and meteorological observation data are used to calculate the relevant parameters, and the transient solar radiation at a specific time on the mountain surface of the study area is estimated comprehensively by using the existing direct solar radiation, sky scattering radiation and ambient topographic reflection models. At the same time, the results are verified according to the hourly solar radiation and total daily radiation data obtained from the meteorological station. The results show that the error mean value of mountain instantaneous solar radiation is 13.56 W/m², and the error mean value of the total daily radiation is 1.49 MJ/m², There is a good consistency between the estimated value and the observed value. The error is small, the precision is high and the parameters are reliable. The distribution of solar radiation in mountainous areas is closely related to topography. In general, the solar radiation on the sunny slope is larger than that on the shady slope, and the solar radiation on the ridge is larger than that in the valley. The solar radiation in the mountainous area decreases with the increase of slope and is affected by factors such as slope aspect and vegetation coverage. The slope radiation has a slight upward trend at a certain slope, and when the slope is greater than the solar zenith angle, the radiation decreases significantly. Affected by vegetation coverage in mountainous areas, with the increase of surface vegetation, surface radiation decreases.