Human obesity is mainly caused by the accumulation of excess fatty substances in subcutaneous and liver areas. Tea contains caffeine, flavanol, vitamins and other compounds, which can promote fat oxidation and remove excess fat in the human body. Therefore, drinking more tea helps to lose weight. According to practical experience, drinking pressed tea such as oolong tea, Tuocha tea, Pu 'er tea and brick tea is more conducive to reducing fat and weight. According to some research data of foreign medical circles, Yunnan Pu 'er tea and Tuocha tea have the functions of losing weight, bodybuilding and preventing cardiovascular diseases. Clinical experiments show that people aged 40-50 can obviously lose weight by drinking Tuocha regularly, and it also has different effects on people of other ages. More than 70% cases significantly reduced the triglyceride content in human body. Oolong tea has obvious function of decomposing fat. Regular drinking can help digestion, diuresis, and help to lose weight and keep fit. Since the autumn of 1979, some countries have set off an upsurge of drinking oolong tea from time to time, especially young women and obese middle-aged women. They spoke highly of oolong tea, and were praised as "slimming tea" and "panacea for beauty and health". There is a saying among ethnic minorities in northwest China that "there is no food for three days and no tea for one day". One of the reasons why they eat high-fat foods such as beef and mutton and milk enzymes without getting fat is that they often drink night brick tea. As for many slimming teas on the market at present, most of them are mainly tea, supplemented by Chinese herbal medicines such as cassia seed and hawthorn, and packaged into teabags, which are more convenient to drink. But its curative effect varies from person to person, and each has certain adaptability. The fundamental way to lose weight is to strengthen physical exercise, otherwise it is difficult to consolidate the weight loss effect of drinking tea.