Sibiricaxanthone B is a xanthone isolated from Polygala tenuifolia.In Vivo: Sibiricaxanthone B, tenuifolin, sibiricose A5, sibiricose A6, tenuifoliside A, ginsenoside Re and ginsenoside Rb1 are oral administered after Kai-Xin-San, The results indicated that Sibiricaxanthone B shows no significant differences in pharmacokinetic parameters in normal and AD rats.