METHODS AND RESULTS:Three kinds of new coumarin-glycosides, Decuroside I (1), Decuroside II (2), Decuroside III (3), which were isolated from the N-butanol extracts of the crude drug Zi-Hua Qian-Hu, the root of PEUCEDANUM DECURSIVUM Maxim. (Umbelliferae), were elucidated to be nodakenetin-4′- O-β-gentiobiose, nodakenetin-4′- Oβ-isomaltose and nodakenetin-4′- O-β-maltose, respectively, by the methods of chemical and spectral analysis. These three new compounds as well as Decuroside IV (4), decuroside V (5) and nodakenin (6) which were also isolated from Zi-Hua Qian-Hu were tested on human platelet aggregation induced by 2 μM ADP. CONCLUSIONS:Among these coumarin-glycosides, 3 and 4, showed the strongest inhibiting activity against the primary and secondary wave aggregation of human platelet. 1 and 2 had a less inhibiting effect or none at all, and 5 was rather promotive against the primary wave aggregation.