Green tea extract is the main extract of green tea in China. It is rich in nutrients and rich in tea polyphenols, catechins, caffeine, amino acids and vitamins. It has a good antioxidant effect due to its high hydroxyl content. Free radicals are biochemical products produced by the human body during its own metabolism and life activities. Excessive free radicals can cause a variety of diseases in the human body, which can be manifested as sagging and aging of the skin. Green tea extract has the ability to scavenge DPPH free radicals, hydroxyl radicals and superoxide anions. The green tea extract has good anti-oxidation effect, and it can be converted into an inert substance by binding with free radicals in the body, preventing free radical reaction in the body, having a good therapeutic effect on skin aging, and it is a natural extract with high safety.