Drinking tea can not only give people spiritual pleasure, but also supplement water, amino acids, vitamins, tea polyphenols, alkaloids, flavonoids, aromatic substances and other beneficial organic substances, and also provide essential mineral elements for the normal operation of human tissues. Among them, potassium, sodium, calcium, magnesium, phosphorus, manganese, iron, zinc, copper, nickel, strontium, chromium, cobalt, molybdenum, tin and vanadium are recognized as essential elements for human body. These elements must be continuously supplied from the diet to maintain the normal physiological functions of the human body. Barium is considered essential, while aluminum is a harmless element. Compared with ordinary meals and drinks, drinking tea is the most meaningful for the intake of potassium, magnesium, manganese, zinc and other elements. The content of potassium in tea is the highest among mineral elements, which is 10 ~ 20 times that of vegetables, fruits and cereals. According to the test, the potassium in Anhui "Tunlu" tea is 100 ~ 150 times that of sodium. Drinking three cups of Tunliu every day can intake 226mg of potassium and 0.24 mg of sodium/kloc-0. It can be seen that tea is a kind of drink with high potassium and low sodium, which meets the needs of human body. Potassium deficiency can lead to muscle weakness, rapid heartbeat, arrhythmia and even hypokalemia, which will eventually lead to cardiac arrest. The potassium content of Tunqing from grade one to grade six is very high, and there is little change between grades. The leaching rate of potassium in tea soup is positively correlated with the content of dry tea. Therefore, drinking green at all levels can be used as an important source of potassium supplement for human body. The content of magnesium and manganese in tea is high, which also has a positive effect on human health. Magnesium and manganese are often used as activators of enzymes to participate in human cell metabolism. It is reported that the incidence of cancer is low in areas with high content of magnesium and manganese in soil, and the content of magnesium in food in longevity areas is higher than that in general areas. There is little difference in magnesium content between different grades of Tunlu tea, which can be used as a supplementary source of magnesium for human body. Tea is a kind of manganese-collecting plant, and its content is about 300 mg/kg, which is about 50 times higher than that of fruits and vegetables. The content of manganese in dry tea varies greatly, and it is reported that the content of manganese in tea with high maturity exceeds1000 mg/kg. Because the leaching rate of manganese in coarse old tea is low, it is safe to drink one to six grades of tunlv (the safe and suitable intake of manganese in RDA revised by China 1989 is 2.5 ~ 5.0 mg/d). Zinc is involved in protein's metabolism, children's growth and development, insulin function, wound healing, taste sensitivity and the synthesis of enzymes related to digestion and respiration. However, it only exists in trace amounts in fruits, and its content in vegetables, cereals and beans is quite low. Moreover, zinc in general plant foods is not easily absorbed by the human body due to the influence of phytic acid (contained in cereals and beans), oxalic acid (contained in spinach) and high fiber (contained in vegetables). Animal food is the main source of zinc in human body, but some middle-aged and elderly people often reduce their intake of meat to avoid a large intake of animal fat and cholesterol, thus reducing their intake of zinc. The content of zinc in tea is higher than that in eggs and pork, and the leaching rate of zinc in tea soup is high, which is easy to be absorbed by human body, so tea is listed as one of the high-quality sources of zinc by nutritionists. The better the quality and grade of tea, the higher the leaching rate of zinc. Therefore, drinking high-grade tea is an important way for human body to supplement zinc. Drinking tea is also a supplementary source of essential macro-element phosphorus and essential trace elements copper, nickel, radium, chromium, molybdenum, tin and vanadium. The content of calcium in tea is 10-20 times that of fruits and vegetables. The content of iron is 30 ~ 50 times that of fruits and vegetables. However, due to the low leaching rate of calcium and iron in tea soup, it is far from meeting the daily needs of human body. Therefore, drinking tea can not be used as a dependent way for human body to supplement calcium and iron. Aluminum is a harmless element that the human body does not need. The content of aluminum in tea is much higher than that of ordinary food, and it increases with the decline of tea grade. So some people worry that drinking tea may be harmful to health because of the high aluminum content in tea. But in fact, in daily life, aluminum can enter the human body through many ways, such as the widely used aluminum cookware, the main mixture of toothpaste (aluminum hydroxide), the antacid for treating stomach diseases (aluminum hydroxide), the additive of fried dough sticks and vermicelli (alum). British scientists have proved that aluminum is not easily absorbed by human body. According to scientific analysis, even if you drink oolong tea with high aluminum content every day, the aluminum intake is within the safe limit. It is reported that the elderly are different from healthy young people because their metabolic function declines, which leads to the loss of essential elements and the accumulation of non-essential elements in the human body. At this time, the body can not effectively prevent the aluminum that has been ingested into the body from entering the brain, which may cause obstacles to the cranial nerves. Therefore, frail middle-aged and elderly people should pay attention to reducing aluminum intake in many ways, and choose high-quality and tender tea for drinking tea. In a word, drinking tea has obtained essential mineral elements such as potassium, sodium, magnesium, manganese, zinc, copper, phosphorus, chromium, cobalt, strontium, nickel, tin, vanadium, molybdenum, etc. The proportion of potassium and sodium is appropriate, and high zinc and manganese are the unique features of tea. The author suggests that besides drinking tea, we should supplement the human body's demand for calcium and iron from other ways. At the same time, we suggest that people who are weak drink medium and high-grade tea to obtain high zinc content and reduce aluminum intake, so as to achieve the purpose of strengthening the body.