green tea retains more natural substances in fresh leaves. More than 85% of tea polyphenols and caffeine in fresh leaves are retained, and about 5% of chlorophyll is retained, and the loss of vitamins is less, thus forming the characteristics of green tea with clear soup, fresh taste and strong convergence. The results of scientific research show that the natural substances retained in green tea have the functions of anti-aging, anti-cancer, sterilization and anti-inflammation, and are suitable for young people, computer workers and people who smoke and drink.