Salt is one of the first condiments used by mankind and has a long history of 4,000 to 5,000 years. The Book of Shang says: “If you make a soup, you can only use salt and plum.” Among the five flavors, salt is the first, so salt is also ranked first among the condiments. Salt was first included in the Shennong Ben Cao Jing, and was classified as a middle grade. Salty and cold in nature, it enters the stomach, kidney, large and small intestine meridian. It can “remove annoyance and heat, brighten the eyes and calm the heart, and clear the stomach of food and drink heat knots”. It has the function of gushing out, clearing fire and cooling blood, and detoxifying. It is widely used in the treatment, prevention or relief of wind-heat toothache, tooth declaration, sore throat, eye disease, foot disease, deficiency labor, worm belly pain, malignant sores, bad breath, women’s abdominal pain and other clinical miscellaneous diseases. The medicinal use of salt 1, Chung vomit: chest phlegm and drink, typhoid fever malaria must vomit, to salt soup vomit. 2, stop the heart and abdomen stroke pain: cholera abdominal pain, fried salt a packet, iron its heart and abdomen, so that the gas through, and a packet of iron its back. 3, bright eyes and firm teeth: sea salt, with a hundred boiling soup bubble scattered, clear juice boiled to get snow white salt flowers, every morning wipe teeth weezing water, point water to wash the eyes, sit closed for a long time, wash the face. 4, wind-heat toothache: acacia branch decoction of two bowls of thick soup, into a pound of salt, boiled dry fried research, daily use wipe teeth. 5, children do not urinate: An salt in the umbilicus, moxibustion with moxa . Salt was used to concoct drugs first seen in the North and South Dynasties, “Lei Gong gun sizzling theory” Wu Juju item. At present, the commonly used salt concoction of drugs such as Zhi Mu, Ze Xie, Baji Tian, Xiao Yin Xiang, Puzzle, Eucommia, Boneset, Phellodendron, Lychee kernel, Che Qian Zi, Fenugreek and other drugs into the kidney meridian. According to the salt medicine and method, it seems that the purpose of the salt system is to correct the taste, remove toxic side effects, help pharmaceuticals, better performance and enhance the specificity of the effect of the medicine. The method of salt water washing was recorded for Panax, snake shedding, Dilong, orange red and yellow orange peel. Following the emergence of the salt method for the toxic drug Chuanwu. The most influential in later times would have to be the theory of entering salt in the “Ben Cao Meng Tsuen” to walk the kidney and soften the firmness. For example, Eucommia tulipifolia, sweet, slightly pungent and warm, is used raw to nourish the liver and strengthen the tendons and bones of the kidney. After salt preparation, it can reach the lower jiao, also into the kidney, salty and bitter to diarrhea the phase fire, mostly used for kidney deficiency and lumbar pain, impotence, women’s fetal leakage, fetal restlessness. It is used for vomiting, diarrhea, salivation and salivation. After salt sizzling, it can moderate the pungent taste, and after salt preparation, it can cure spermatorrhea, more urination at night, and residual leaking of urine. With salt to send Chinese medicine: where to take Yin pill, it is appropriate to salt soup sent down. Salt, less use can receive medicine into the kidney, take the kidney medicine with salt soup, salty to the kidney, lead the medicine gas into the organ also. As the literature contains, the treatment of the elderly, flat tonic lower yuan, bright purpose Cistanches pill, flat tonic qi and blood, nourishing yin and lowering the fire of the kidney pill, the two sides are “salt soup down”, such delivery method many. The five functions of salt Modern research shows that salt has five major functions for human life: first, to maintain the balance of water inside and outside the cells, second, to participate in and regulate the acid-base balance in the body, third, to maintain the normal excitability of nerves and muscles, fourth, blood, pancreatic secretion, lymphatic fluid, bile, sweat, tears, and fifth, a component of the gastric juice hydrochloric acid. The reason why people need to consume a certain amount of salt every day is mainly to replenish the salt reduced due to excretion in human physiological activities. The human body sweats all the time, and more than 1 liter of urine per day, and the excretion of feces, all take away a large amount of salt. Normally, the kidneys are the main excretory organ for sodium. It can be said that normal human kidneys regulate salt with the amount of food intake, when the amount of salt intake is more, more excretion, when less, less excretion and more retention, can basically maintain its certain concentration. As the ancients say: breaking salt is not the way, diet without taste. But salt can not eat too much, “Chinese hypertension prevention and treatment guidelines 2018 revised version (for comment)” pointed out that high sodium, low potassium diet is an important risk factor for hypertension in our population. The status survey found that the average cooking salt intake of Chinese residents aged 18 years and above was 10.5 g in 2012, which was lower than 12.9 g in 1992 and 12.0 g in 2002, but still 75.0% higher than the recommended level of salt intake, and the Chinese population is generally sensitive to sodium. Therefore, it is recommended that patients with hypertension should reduce sodium intake to <6 g per person per day, and increase potassium intake. Although salt is an indispensable substance in people's daily diet, too low and too high salt intake are both harmful to health. Therefore, salt should be consumed in moderation in order to have both health and taste.