Abstract: Chemical compositions, including proximate composition, mineral, fatty acid and monosaccharide compositions of inner barks and extractives of the Eucommia ulmoides Oliv. were studied. Carbohydrate(92.97%)was the major constituent in proximate composition of E. ulmoides inner barks. The most quantitatively abundant constituents of fatty acid, mineral and [JP3]monosaccharide compositions were α-linolenic acid(27.4%), Ca(5.1769mg/g)and glucose(130.51mg/g), respectively. From the water soluble fraction of E. ulmoide inner barks, 5 compounds were isolated and their structures were elucidated as astragalin (1), isoquercetrin (2), quercetin-3-O-xyloglucoside (3), isochlorogenic acid A (4) and isochlorogenic acid C (5) by spectroscopic analyses and chemical evidence. Compounds 3-5 were isolated for the first time from this species.

Key words: Eucommia ulmoides Oliv., inner barks, chemical composition, extractives