Abstract: Anthraquinone constituents in the seed of Cassia tora L. were investigated. Seven anthraquinone compounds were isolated from chloroform extract of the seed of C. tora with silicagel column chromatography. Their structures were elucidated through physiochemical and spectral analyses. They were identified to be chrysophanol (Ⅰ), physcion (Ⅱ), emodin (Ⅲ), chryso-obtusin (Ⅳ), 8-O-methylchrysophanol (Ⅴ), 1-O-methylemodin (Ⅵ) and 1,2-dimethoxy-8-hydroxy-3-methyl-9,10-anthraquinone (Ⅶ). Compounds Ⅴ-Ⅶ were obtained from thisgenus of plant for the first time.