Before 1938, only sun-cured green tea was produced in Yunnan, that is, fresh leaves of Yunnan big leaf species were made by deactivating enzymes, rolling and drying in the sun. Therefore, Pu 'er tea in history generally refers to the sun-dried green tea and various specifications of pressed tea in the original Simao area of Yunnan (now Simao and Xishuangbanna) as raw materials, concentrated in the location of Pu 'er House (now Pu 'er County). After long-distance transportation and long-term storage, sun-dried green tea and its finished products are slowly oxidized, the appearance and color of dry tea gradually turn reddish brown, and the soup turns red and sweet. After 1973, in order to meet the international market demand for Pu 'er tea, Yunnan Tea Import and Export Corporation used sun-dried green tea in Kunming Tea Factory to promote post-fermentation and aging, forming the current Pu 'er tea style. In the classification of tea plants, Pu 'er tea is a kind of tea plants and the most precious tea germplasm resources in China.

China people first became attached to tea because of its health care function. The relationship between tea and medicine, tea and health, ancient and modern, Chinese and foreign related discussions are numerous. "Historical Records of Huang San" contains: "Shennong tasted a hundred herbs and encountered seventy-two poisons every day, which was solved by tea." It can be seen that in ancient times, the medical and health care efficacy of tea has been recognized by our ancestors. In recent years, Professor Hong Zhaoguang, a health care master, has been recognized by all walks of life for his scientific health care. Professor Hong mentioned the health care function of tea many times in his lecture. Although it is a drink, it is better than medicine. Especially Pu 'er tea, the health care function of its active components to human body is being continuously excavated and expanded. At present, there are more than 500 kinds of organic components, such as tea polyphenols, caffeine, protein, amino acids, vitamins, carbohydrates, lipids, and various minerals such as potassium, sodium, calcium, copper, iron, selenium, phosphorus, manganese and zinc. These ingredients not only make tea have mellow and attractive fragrance, but also make it mild and delicious, and have many health care effects such as hangover relieving, refreshing, clearing away heat, relieving depression, resolving phlegm, nourishing stomach, reducing weight and so on. Therefore, in European and American countries, Pu 'er tea has long been regarded as a good medicine for daily health care and slimming.

Many medical experiments have proved that long-term continuous drinking of Pu 'er tea can reduce blood lipid by nearly 30%. In Modol Hospital in creteil, doctors give 20 patients with hyperlipidemia three bowls of Pu 'er tea every day. After one month, the patients' blood lipid decreased by almost a quarter, while the patients who drank the same amount of other tea had no obvious change in their blood lipid content. This shows that drinking a cup of Pu 'er tea after each meal can effectively stimulate metabolism and accelerate fat decomposition. Moreover, according to international online reports, Pu 'er tea also plays a certain role in maintaining weight loss. Caffeine in Pu 'er tea can help strengthen the body to burn fat, while tea polyphenols can more effectively assist the decomposition and digestion of fat and maintain the effect of losing weight.

Tea polyphenols in Pu 'er tea are the general name of phenolic substances in tea, which contain at least seven important catechins, and the unique chemical structure of catechins can help the human body eliminate free radicals. The production of free radicals in human body comes from daily metabolism, environmental pollution, pesticides, heavy metal pollution, ultraviolet rays, electromagnetic waves, drug abuse, depression and tension. Excessive accumulation of free radicals in the human body will cause many diseases and aging. According to many research reports, catechin can effectively remove free radicals and reactive oxygen species in human body, which plays an important role in improving human immune function, strengthening body, prolonging life, expelling toxins and caring skin.

In addition, many effective elements in Pu 'er tea play a significant role in warming and nourishing the stomach, preventing gastric ulcer, improving constipation and preventing dental caries. Now it enjoys the reputation of "beauty tea", "slimming tea", "longevity tea" and "slimming tea" in Japan, South Korea, Germany, Italy and Southeast Asia.