The FY_3D satellite medium-resolution imager (MERSI-II) has been primarily used for meteorological observation, environmental monitoring, disaster prevention, and mitigation. As the observation angle of FY_3D satellite transit is expected to affect the calibration accuracy, this study proposes a site calibration method based on bidirectional reflectance distribution function (BRDF) model. In July 2022, a satellite-ground synchronous measurement experiment was conducted in the Dunhuang calibration field, and 42 BRDF models were established based on six kernel-function combinations which included seven sets of unmanned aerial vehicle multiangle observation data at different moments in 2020. Consequently, the applicability of the constructed BRDF model for the FY_3D images obtained from different observation angles was analyzed. The relative deviation between the apparent reflectance of each band of the sensor based on the BRDF model and that measured by the satellite was calculated. The results show that the difference between the corrected surface reflectance of different models is not more than 1% affected by the time and sun angle, and not more than 3% affected by the different combinations of the kernel functions of FY_3D. Furthermore, the average relative deviation of apparent reflectance from satellite observations calculated by the B1-B12 band model of MERSI-II in 2021 was less than 5.22%, whereas that from satellite observations calculated by the B1 and B2 band models in 2022 was more than 8%; the remaining bands were less than 5.74%.