为有效评估集热塔散射辐射对敦煌场区光环境的影响程度，本文采用Monte Carlo三维辐射传输模型模拟与CE318多通道光度计等高线实测分析相结合的定量分析方法，以解决散射辐射交融于背景辐射中难以定量评估的问题。通过使用新型的ASC200云量自动观测仪，提高晴空辩识精度。通过开发CE318四象限定位修正算法，有效提高观测数据质量。2020年1~3月收集到的有效数据显示除了550 nm通道，集热塔未对天空漫射辐射产生明显影响。对于500 nm通道，在有效数据对应的观测几何下（距离0.87~3.07 km，观测天顶角为77.30°~51.32°），集热塔吸热器对天空漫射辐射的影响不超过0.93%。与模型模拟结果相结合进行分析，得出如下结论：当距离电站2 km时大电站散射辐射带来的天空漫射辐射相对变化<1.62%；当与电站距离≥3 km时相对变化<0.93%。本项研究成果对利用敦煌场开展遥感定量化应用、准确评估发电站引进的不确定度因素具有积极意义。

In order to effectively evaluate the influence of scattered radiation of the heat collection tower on the optical environment of the Dunhuang Gobi Site of the Chinese Radiometric Calibration Sites (CRCS), the Monte Carlo three-dimensional radiation transmission model simulation combined with in situ CE318 multi-channel photometer almucantar measurements was applied to solve the problem that it is difficult to quantitatively evaluate the scattered radiation mixed with the background radiation. By measuring the data with a new cloud cover automatic observing instrument ASC200, the accuracy of clear sky measurements improved, and the development of the CE318 four-quadrant location correction algorithm effectively increased the amount of valid data that meets our threshold requirements. The effective data collected from January to March 2020 shows that the molten salt tower Concentrating Solar Power (CSP) project has no significant impact on the sky diffuse radiation outside the 550nm channel. In the 500 nm channel, under the geometric parameters corresponding to the valid data (distance 0.87-3.07 km, observation zenith angle 77.30-51.32º), the impact of the molten salt tower heat absorber on diffuse sky radiation does not exceed 0.93%. Combined with the analysis of the model simulation results, it can be concluded that the relative change of the sky diffuse radiation caused by the scattered radiation of the large power station is less than 1.62% at 2 km away, and the relative change is less than 0.93% when it is at least 3 km away. The research results have positive significance for the use of Dunhuang Site to conduct quantitative applications in remote sensing and the accurate evaluation of the uncertainties introduced by power stations.