Abstract: Theabrownin is a brown polymer which is formed by the further oxidation and polymerization of theaflavin and thearubigins; in terms of its structure, it contains hydroxyl, carboxyl, alkyl and benzene analogs, so it is endowed with relatively strong antioxidant, anticancer, reducing blood lipid and other efficacy. This paper summarizes the composition structure, formation and accumulation, and functional activity.Finally, puts forward the difficulties confronted in the current research and envisions its prospect.