Abstract: Eighteen polyphenols were isolated from the ethanol extract of the leaves of Castanopsis fordii Hance using Sephadex LH-20,MCI gel CHP 20P,Toyopearl Butyl-650C column chromatographies and semi-preparative HPLC.Their structures were identified by spectral analysis and were determined as gallic acid(1),methyl gallate(2),ethyl gallate(3),3-O-galloyl-(-)-shikimic acid(4),3,3′-di-O-methylellagic acid(5),3,3′-di-O-methyl ellagic acid-4′-O-α-D-xylopyranoside(6),3-O-methy-lellagic acid 4′-O-rhamnopyranoside(7),6-O-galloylarbutin(8),gentisic acid 5-O-β-D-(6′-O-galloyl)-glucopyranoside(9),4-hydroxy-3-methoxyphenol 1-O-β-D-(6′-O-galloyl)glucoside(10),1,6-di-O-galloyl-β-D-glucose(11),1,6-di-O-3-galloyl-D-glucose(12),benzyl 6-O-galloyl-D-glucopyranoside(13),2,3-diO-galloyl-D-glucose(14),gemin D(15),tellimagrandin(16),eugeniin(17),viburnolide A(18).All the compounds were isolated from this plant for the first time.

Key words: Castanopsis fordii Hance, polyphenols, isolation and separation, structural identification