In order to calibrate the visible and near-infrared channels of FY-2C & FY-2D’s visible and infrared spin-scanning radiometer (VISSR), National Satellite Meteorlogical Center (NSMC) associated with other organizations went to China radiometric calibration site of remote sensing satellite-Dunhuang to take site vicarious calibration synchronous experiment. The experiment continued for three months and a lot of experimental data have been gotten. From four days’ experimental data, the calibration coefficients with relative standard deviations below 5.6% (FY-2C) and 2.4% (FY-2D) are calculated. The reflectance of Dunhuang was corrected by the bidirectional reflectance distribution function (BRDF) model calculated by Liu Jingjing, the apparent reflectance was calculated by the use of 6S model and was corrected by the sun zenith cosine and sun-earth distance. From the different experimental data measured in different field conditions and sun position, the accordant calibration coefficients were gotten, and it showed the veracity and stability of the calibration arithmetic.