From the water soluble extract of Flos Lonicera japonica Thunb.,three triterpenoid saponins were isolated. On the basis of detailed analysis of 1HNMR, 13CNMR, 1H-1HCOSY, HMBC, HMQC, FAB MS, their structures were decided as 3-O-?- L-rhamnopyranosyl-(1→2)-?-L-arabinopyranosyl hederagenin 28-O-?-Dxylpyranosyl (1→6 )-?-D-glucopyranosyl ester (Ⅰ), 3-O-?-L-arabinopyranosyl hederagenin 28-O-?-L-rhamnopyranosyl (1→2) [?-D-xylpyranosyl (1→6)] -?-glucopyranosyl ester (Ⅱ) a nd 3-O-?-L-rhamnopyranosyl (1→2) -?-L-arabinopyranosyl hederagenin 28-O-?-L-rhamnopyranosyl (1→2)[?-D-xylpyranosyl (1→6)]?-D-glucopyranosyl ester（Ⅲ), and chlorogenin tetraacetate (Ⅳ). Pharmacological experiment showed thatthese compounds had cytoprotective effects against carbon tetrachloride induced hepatic injury.