Tea polyphenols are compounds of flavanols. It has a strong antioxidant effect, so it can inhibit the peroxidation of substances and play an anti-aging role. It can also eliminate oxygen free radicals, effectively prevent the peroxidation of low density lipoprotein, protect endothelial cells, prevent the formation of smooth muscle and plaque of the blood vessel and abnormal proliferation of the blood vessel, so it can prevent arteriosclerosis, coronary heart disease, angina pectoris and the like. But also has anti-radiation effect, mainly reducing oxygen metabolism and avoiding human poisoning. In a word, tea polyphenols have a wide range of functions.