介绍了多种插值方法与曲线拟合方法，对光谱辐射照度标准灯在所需波长间隔上的照度值进行内插运算，包括这些方法的模型建立、参数计算及误差分析过程。得到了效果较好的插值方法及分段普朗克曲线拟合模型，其中拟合模型较好地体现了光谱辐射照度标准灯的灯丝发射率及灯壳的光谱透射比。最终结果的相对偏差接近国家级计量院提供标准灯的最佳不确定度0.2%。

Several methods of the data interpolating and curve fitting are introduced. The interpolating operation of the illumination values at the wavelength intervals required by the spectral irradiance standard lamp was performed, in which the establishment of mathematical model, calculation of parameters and analysis of errors were involved. The satisfactory interpolating method and curve fitting model are obtained, and its relative deviations are close to the best uncertainty of the spectral irradiance standard lamp provided by National Institute of Metrology, which is 0.2%.