Chemical investigation of the aerial parts of Chloranthus japonicus Sieb. led to the isolation a new compound, 9-hydroxy heterogorgiolide (1) and $isofraxidin-7-O-{eta}-D-glucopyranoside$ (2), the isolation of which is reported for the first time from this plant, along with the known components, ${eta}-sitosterol,;{eta}-sitosterol-3-O-{eta}-D-glucopyranoside$, palmitic acid and octacosanoic acid. The structures of compound 1 and 2 were determined on the basis of spectroscopic data including two dimensional NMR and high resolution MS.