Zhang Jinyue, a medical doctor of the Ming Dynasty, described the kidney in his “Jing Yue Quan Shu”: “The great treasure of the sky is only this round of red sun, and the great treasure of man is only this breath of true sun.” The growth and development of all things in heaven and earth cannot be achieved without the sun’s irradiation, and for heaven and earth, the sun is the most precious thing. For the human body, the growth and development of human beings need to rely on Yang energy to support, and Yang energy is mainly stored in the kidney, which is a precious thing for the human body. The role of the kidney runs throughout life, and the care of the kidney should also run through the whole life of a person. According to Chinese medicine, the kidney is the innate essence of the human body and has three main functions. 1, the main collection of essence, in charge of human reproduction, growth and development. The surplus and deficit of kidney essence affects the birth, growth, strength, aging and death of human beings, echoing the birth, growth, collection and hiding of nature. 2, the main water and liquid, is the body’s water and liquid metabolism of the general switch, the body from the external intake of water and liquid through the kidney Yang warming, steaming, together with the participation of other organs, the water and liquid transported to all parts of the body for the body to use. The wastewater and waste fluids metabolized in the body converge on the bladder under the action of the kidney and bladder qi and are discharged from the body. 3, the main nasal qi, nasal, that is, the receipt, intake of the meaning. The kidney has the physiological function of taking in the clear qi inhaled by the lungs and preventing superficial breathing. In addition to its own unique functions, the kidney is also closely connected to other organs. 1.Relationship with the liver: It is often said that “liver and kidney are of the same origin”. Under normal physiological condition, liver blood needs to depend on the nourishment of kidney essence, and kidney essence depends on the continuous replenishment of liver blood, and liver blood and kidney essence are mutually gifted and transformed. 2, the relationship with the lung: kidney is water, lung is gold, gold produces water, lung and kidney are like mother and son. Although the lungs are responsible for the breath, the depth of the breath is closely related to the kidney’s gas, and the breath is in and out of the air, the main in the lungs and the root in the kidneys. 3, and the relationship between the spleen: “Medical Zong must read – deficiency labor” mentioned: “…… spleen and kidney, water for the yuan of all things, earth for the mother of all things, the two organs and peace, a whole body are cured, a hundred diseases do not arise.” The spleen and stomach transport water and grain essence, must be warmed by the kidney Yang, the kidney essence also depends on the continuous replenishment and transformation of water and grain essence. The spleen and the kidney are mutually supportive and influence each other. 4, and the heart of the relationship: kidney Yang rise, can warm the heart fire; heart fire down, can control the kidney water flood; kidney water and can control the heart fire and benefit the heart yin. Heart and kidney intertwine, water and fire together. In daily life, if you do not pay attention to life and diet, often stay up late and work overtime, indiscriminate intercourse, thin clothing, eating cold food, etc., easy to hurt the kidneys, resulting in kidney deficiency. It is often accompanied by soreness and pain in the waist and knees, and premature decline in sexual function. Among the many types of evidence, the most common are kidney yang deficiency and kidney yin deficiency. The Classics. Yin and Yang” says: “Human diseases …… must have their origin, either in yin or in yang, although there are many variations, their origin is one”. Yang is active and dispersing, which can promote the gasification of all things. Yin is static and condensed, and can promote the formation of all things. In the case of kidney, a deficiency of kidney yang is like having enough water in the pot, but not enough fire, the body loses the warming, pushing, transpiration and vaporization of yang, the temperature rises slowly, the water evaporates slowly, and shows signs of deficiency cold. The kidney Yin deficiency is the opposite, the pot has less water inside, the fire is full, the temperature inside the pot rises faster, the water evaporates quickly, the body has less Yin to control Yang, the role of nourishment, moistening, etc. is reduced, showing signs of deficiency heat. The occurrence of diseases is closely related to the imbalance of yin and yang, and the regulation of the balance of yin and yang in the human body should start with kidney conditioning. Moreover, the occurrence of disease is not limited to a certain internal organ, the meridian system runs through all parts of the body, if the kidneys have problems, other organs will also be affected.