In order to make the changes in performance of CO2 detector get corrected,it studied the method of satel-lite radiometric calibration of CO2 detector. Firstly,it used the combination of the sun and diffuse board to achieve ab-solute radiometric calibration of detectors on CO2 detector. Secondly,to get a relative radiometric calibration,it moni-tored the reflectivity of diffuse board through a combination of calibration lamp, diffuse board and calibration detector. Finally,it corrected the performance changes in the calibration lamps and calibration detectors using the method of com-parison dual calibration lamps and dual calibration detectors. And then,it realized high-precision satellite radiometric cal-ibration on the CO2 detector. The experimental results showed that the calibration lamp's stability was better than 1%, the calibration detector's linearity was better than 0.01%. All in all,the absolute and relative radiometric calibration ac-curacy on CO2 detector met the requirement of accuracy,which were 5% and 3%.%为了使CO2探测仪性能变化得到校正，对CO2探测仪的星上辐射定标方法进行了研究。首先，利用稳定辐射源太阳与漫反射板相结合实现CO2探测仪探测器绝对辐射定标，其次，以定标灯、漫反射板与定标探测器相结合的方法对漫反射板反射率进行监视，实现CO2探测仪的相对辐射定标。最后，采用双定标灯、双定标探测器相互比对的方法对定标灯、定标探测器的性能变化进行校正，进而实现CO2探测仪的高精度星上辐射定标。实验结果表明：星上定标灯稳定性优于1%，星上定标探测器线性度优于0.01%。方案可以实现CO2探测仪绝对辐射定标5%，相对辐射定标3%的精度要求。
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