Abstract: Walnut is always well known for its super antioxidation and often called“the king of antioxidation”.In this paper, the antioxidation and the physiological function of walnut organ including walnut blossom, nutshell, green peel, blade and branch, and its components including protein and its zymolyte, oil, polyphenol and so on, were reviewed.The problems in study on the antioxidation of walnut were proposed and the research direction which should be paid attention to was prospected.