Three kinds of color photographic papers were used for preparing the test patches (Y. C. M. & Gray), and the patches were irradiated with white fluorescent lamps of 8400lx for 46 days at 30°C, 75% RH as an accelerated light fading test. The fading of the patches were evaluated according to the specification of color difference ( ΔE ^*) of CIE 1976 ( L ^* a ^* b ^*) space [CIELAB], and also the change of ΔE ^* was discussed compared with the change of color density. The test paches showed the characteristic fading, and the fading comprised of discoloration and color fading was cleared by the specifications of ΔE ^* and the analysis of ΔE ^* to ΔH , ΔC and ΔL . The fading proceeded rapidly at very initial irradiation period (1-4 days), and it was restored once and then the fading proceeded gradually again according to increase of irradiation time. From the results of these characteristic fading, it is considered that the fading proceeds with complex mechanism. The effect of yellow stein on the fading was observed, and the content of the yellowing was cleared from the analysis of the fading by ΔE ^* specification method.