A composition, and a crocins active site extracted from Gardenia jasminoides Ellis, mainly comprising the following ingredients: crocetin di-²-D-gentiobioside, crocetin-²-D-glucopyranosyl-²-D-gentiobios ide, crocetin di-²-D-glucopyranoside, 13Z-crocetin di-²-D-gentiobioside, neocrocin B, crocetin mono-²-D-gentiobioside, 13Z-crocetin-8-O-P-D-gentiobioside, 13Z-crocetin-8'-O-²-D-gentiobioside, and crocetin mono-²-D-glucopyranoside. Pharmacological experiment results show that the crocins active site can effectively improve learning and memory injuries in mice induced by scopolamine and amyloid ² protein.