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Two new triterpenoid saponins. tanguticosidc A and B were isolated tyonl aerial part ofClematis tangutica, Their structures were elucidated as 3-0-5-D-gltlcopyranosyl hederagenin 280-a-L-rhamnopyranosy- (1-4)-0-D-glucopyranosyl- (1-6)-f-D-glucopyranosidel and 3-0D-glucopyranosyl- (1-2)-f-D-glucopyranosyl hederagenin 28-0-a-L-rhamnopyranosyl- (1-4)0-D-glucopyranosyl- (1-6)-0-D-glucopyranoside2, rcspectively