A new phenylalkanoid, (E)-3-hydroxy-1-(4'-dihydroxy-3',5'-dimethoxy-phenyl)-dodecan-6-en-5-one (1) was isolated from the rhizomes of Chinese ginger (Zingiber officinale Roscoe (Zingiberaceae)). The structure of this new phenylalkanoid was elucidated by chemical and physical evidences.