Three kinds of the distillated-diethyl ether extracts from the raw Rehmanniae Rhizoma, steam dried Rehmanniae Rhizoma and steamed Rehmanniae Rhizoma, for the chemical identification, was extracted by the Soxhlet extraction apparatus. The distillated-diethyl ether extracts of the three kinds Rehmanniae Rhizoma was easily identified in the spectral propertiies as the degree of optical density from ultraviolet range to visible region in the spectrophotometric method. For recognition of the spectral properties, the means of column chromatography was also performed. It was suggested from experimental results that the amount of the organic color compoLmd, chlorophyll a and chlorophyll b of the distillated-diethyl ether extracts in the steamed Rhemanniae Rhizoma is reduced during the steam distillating process. And the steamed Rehmanniae Rhizoma was found to be identified mainly in the optical density and the absorption ratio (E400㎚/E300㎚, E450㎚/E350㎚) from the raw and steam dried Rehmanniae Rhizoma.