Bittering tea has big leaf bittering and small leaf bittering, big leaf bittering is mainly produced in Guangdong, Fujian, Hainan and other places; small leaf bittering is mainly produced in Sichuan (also known as the green mountain green water). Bittering tea is a natural health drink, nature of the cold, tea taste bitter and then sweet and cool, with heat elimination, eyesight benefit, thirst, diuretic strong heart, moistening the throat to relieve cough, lowering blood pressure and weight loss, cancer suppression and prevention of cancer, anti-aging, blood circulation, and other efficacy. It is not suitable for people with cold body, menstruating women and women in labor, and people with bad stomach and intestines. When brewing, large-leafed bittersweet can be put one; small-leafed bittersweet can be put about 3 grams, less should not be more.