T his paper focuses on radiometric calibration of triple-band optical imaging system which includes near ultraviolet (300 nm~380 nm) ,visible (380 nm~760 nm) and near infra-red (760 nm~1 100 nm) ranges .The radiometric calibration system was set up ,the mathe-matical model was established and the radiometric calibration experiment was conducted .As the optical system operated at three wavebands ,technique of sub-band radiometric calibration was adopted .The calibration data were fitted by linear least squares and then the algorithm was modified .At last the calibration data were processed .Experimental results verify the cali-bration accuracy of two methods .The calibration curve obtained by the modified algorithm is with higher accuracy .The relative error of measurements can be less than 5% ,which meets the needs of actual projects .%系统的成像波段分别为近紫外（300 nm～380 nm ）波段，可见光（380 nm～760 nm ）波段和近红外（760 nm～1100 nm ）波段。通过搭建与该光学系统相对应的辐射定标装置，建立辐射定标数学模型，对已研制的三波段成像光学系统进行绝对辐射定标的研究。针对系统成像波段光谱范围较宽的特点，以分波段辐射定标方法对于测量得到的定标数据，采用最小二乘线性拟合法进行处理，对算法进行修正，再对定标数据进行处理。通过实验验证了2种方法的定标精度，结果表明：修正后的算法可得到精度更高的定标曲线，测量相对误差不超过5％，定标结果满足实际工程需求。
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