Abstract: Twenty-three compounds were isolated from the ethanol extracts of rhizomes of  Dioscorea bulbifera by application of various chromatographic methods.Based on spectrum analyses in combination with literature data comparison,their structures were identified as 2,7-dihydroxy-3,4-dimethoxyphenanthrene (1), 7-hydroxy-2,3,4-trimethoxyphenanthrene (2), 3,7-dihydroxy-2,4-dimethoxy-9,10-dihydrophenanthrene (3), 3-hydroxy-2,4,7-trimethoxy-9,10-dihydrophenanthrene (4), 2-hydroxy-3,4,7-trimethoxy-9,10-dihydrophenanthrene (5), 7-hydroxy-2,3,4-trimethoxy-9,10-dihydrophenanthrene (6), 7-hydroxy-2,4-dimethoxy-9,10-dihydrophenanthrene (7), 2-hydroxy-4,7-dimethoxy-9,10-dihydrophenanthrene (8), 2,7-dihydroxy-3,4-dimethoxy-9,10-dihydrophenanthrene (9), 2′-hydroxy-3,4,5-trimethoxybibenzyl (10), 2′,3-dihydroxy-4,5-dimethoxybibenzyl (11), 3-hydroxy-4,5-dimethoxybibenzyl (12), 3,5-dihydroxy-4-methoxybibenzyl (13), pteryxin (14), praeruptorin A (15), kaempferol (16), 7,3′,4′-trihydroxy-3,5-methoxyflavone (17), diosbulbin B (18), diosbulbin G (19), 3-hydroxy-β-damascone (20), (6S,9S)vomifoliol (21), (6S,9R)-vomifoliol (22), blumenol B (23), respectively.Among them, fourteen compounds including 4~8,10,12~15,20~23 were identified from D.bulbifera for the first time.

Key words: Dioscorea bulbifera, stilbenoids, Dioscorea, angular coumarins, norsesquiterpenoids