The water surface of Qinghai Lake which is one of China Radiometric Calibration Site of remote sensing satellite(CRCS) is used as the field of radiometric calibration for the infrared channel of remote sensing satellites.As our spin-stabilized geostationary meteorological satellites,FY-2's infrared channel can't realize an absolute calibration on orbit.Since FY-2 is located at the equator of 105 degrees east longitude to Qinhai Lake,the satellite zenith angle is 36 which is larger than the measurable range of the criterion for radiometric calibration site.This study describes a method to calibrate the infrared channels of geostationary meteorological satellites based on the simultaneous measurement of upwelling sea-surface radiance in the South China Sea.The data analysis for FY-2B and FY-2C shows that the South China Sea is a suitable radiometric calibration site for geostationary meteorological satellites.