Abstract: Ten compounds were isolated from the flavanoids of Rhaponticum uniflorum by macroporous resin and preparation HPLC. Their structures were identified by physicochemical properties,spectroscopic analysis and comparison with the data of literatures.These 10 compounds were 5,7,3′-trihydroxy -6,4′-dimethoxy flavone (1), 5,7,3′-trihydroxy-4′-methoxy flavone (2), pelargidenon (3), luteolin (4), quercetin (5 ), luteolin-7-O-α-D-glucopyranoside(6), quercetin-3-O-α-D-rhamnoside (7), apigenin-7-O-α-D-glucopyranoside(8), Rutin (9), apigenin -7-O-α-D-glucuronid (10). In addition to compound5,the rest were isolated from this plant for the first time.

Key words: Rhaponticum uniflorum (L.)DC, flavanoids, NMR, chemical constituents