Abstract:Tea polyphenols and caffeine are the main active ingredients in tea.Tea polyphenols have functional regulatory antioxidant，antiviral，and lipid-lowering roles.However，caffeine has potential adverse health effects，including raising blood pressure and miscarriage.Hence，there is a wide research concern for removing caffeine from tea while retaining tea polyphenols.In this paper，research progress regarding chemical solvent extraction，physical adsorption，and biodegradation methods for decaffeination were reviewed.