Abstract: Ten compounds were isolated from the methanolic extract of the aerial parts of Onychium lucidum .These compounds were identitied as luteoloside (1),3,7-dimethylquercetin(2),contigoside B(3),onychin (4),lucidol(1β-methoxy-2β,3α,4β,5α,6β-pentahydroxycyclohexane)(5),onychiol B(6),β-sitosterol(7),daucosterol (8),oleanolic acid (9) and sucrose (10). COmpound 5 is a new constituent,while 1,2 and were isolated from the genus Onychium for the first time.

Key words: Sinopteridaceae, Onychium lucidum, Flavone and flavone glcoside, Methoxycyclopolyols