Abstract: To study the chemical constituents from Glehnia littoralis, macroreticular resin column chromatography, repeated column chromatography on Sephadex LH-20 and reverse phase ODS were used to isolate the compounds whose structures were elucidated based on spectroscopic data (ESI-MS, 1D and 2DNMR). From EtOAc-soluble fraction of the ethanol extracts, a new 8-O-4′ neolignan was isolated and named as glehlinoside D (1), along with five known compounds: (-)-secoisolariciresinol (2), ferulic acid (3), caffeic acid (4), vanillic acid (5) and syringin (6). Compound 1 is a new 8-O-4′ neolignan.