Abstract: A method to measure the spectral radiance luminance is introduced. The spectral radiance luminance at the exit of a largediameter hightemperature blackbody was reconstructed with the method based on a hightemperature blackbody. At the same time, the acquired magnitude of the spectral radiance luminance for the standard lamp is transferred by the aid of the relative method. It is found that the acquired magnitude has lower measurement uncertainty. The measurement results are presented in this paper. BB3200K hightemperature blackbody and its measurement system are briefly introduced. The higher stability and satisfactory measuring result were obtained with the system into which an optical feedback system and an accurate temperaturemeasurement system were incorporated.