The word "the root of sealing Tibet" comes from Neijing, and Su Wen's Six Classics of Tibetan Elephants says: "The kidney dominates the thorn, and the root of sealing Tibet is also fine." "Shuo Wen Jie Zi" notes: "Stab, hide also. Hidden people are good, good will hide themselves ... every worm is a thorn. " Bing Wang's evaluation of this sentence is: "The secular household is closed, the sting is deep, and the kidney also governs the water. It is hidden by the essence of the five internal organs, so it is said that the kidney governs the sting and essence. " "The Complete Record of the Ministry of Medicine" said: "In winter, the sun is closed, the stinging insects are hidden deep, and the kidney dominates the winter storage, so it is the root of the stinging storage." The Analogy Classic says: "The kidney and stomach are also closed, and they are located in Haizi, which is the foundation of the main sting seal; The kidney controls water and is hidden in the essence of the five internal organs, so it is also called essence. " In a word, the explanation of "kidney is the foundation of sealing storage" by doctors in past dynasties is mostly based on the interpretation of the text, which is limited to the category of kidney storing essence. They think that kidney is the place where the whole body essence is stored, so it is the foundation of sealing storage. Many doctors find it difficult to explain the true meaning of "Ben" from its literal expression. To explain the connotation of "kidney is Tibetan origin", we must explore ways and methods to solve it from the emergence and evolution of this theory. The formation of the theory of Tibetan image in traditional Chinese medicine has gone through a long and complicated process. Although the finally established theory of Tibetan image does not involve anatomy and morphology, its construction is based on anatomical methods. On the basis of anatomy, through the observation of human physiology, pathological phenomena and nature, and making full use of the speculative method of analogy, the theory of Tibetan image in traditional Chinese medicine with obvious spatial and temporal characteristics was finally formed. The kidney is one of the five internal organs, and the construction of the theory of kidney viscera-state also follows the same evolution track. Through preliminary anatomy, the ancients not only discovered that "there are two kidneys, weighing one catty and one liang" (difficult to pass through forty-two classics) and "kidney is black in color" (five flavors of spirit and pivot), but also discovered the function of kidney in controlling water. Although the final establishment of kidney governing water depends on the repeated observation and comparison of human physiology, pathological phenomena and the relationship with nature, the initial anatomy of "kidney governing water" is the starting point of the connection between kidney and water and plays a key role in this attribution. After the relationship between kidney and water was established, many characteristics associated with kidney were inferred. For example, Su Wen Wu Shu said: "Cold in the north, cold produces water, salty produces water, salty produces kidney, kidney produces bone marrow, and marrow produces liver. The cold of the sky, the water of the earth, the bones of the body, the hardness of qi, and the dirty kidneys. " The water is heavy and moist, the water is abundant in winter, the winter is cold, the vitality is dormant, and everything is hidden. Therefore, the kidney belongs to Tibet in the development process of human growth and storage, and summarizes the characteristics of kidney controlling Tibet. Wind and Tibetan have the same meaning and are synonyms, which are used to describe the physiological characteristics of kidney storage, storage and absorption. The function of kidney storing essence, controlling growth and development, controlling qi intake, defecating and fixing fetus is the concrete manifestation of kidney storing essence. It is not difficult to understand the connotation of "kidney is the foundation of storage" when the origin of the characteristics of kidney controlling storage is clarified. "Su Wen Qian Gu's Innocence" says: "The kidney governs water and hides in the essence of the five internal organs." It can be seen that kidney storing essence includes two parts, namely kidney storing essence and essence of internal organs. The former includes three parts: the innate essence inherited from parents, the reproductive essence formed after physical maturity and the acquired essence. It must be clear that essence is the basic substance that constitutes the human body and promotes human life activities. Although it can be divided into kidney itself and other organs, this is only a conceptual distinction. In fact, the essence is hidden in the kidney and cannot be completely separated. It is precisely because the kidney contains the essence of the five internal organs that the kidney has the characteristics of the five internal organs, so that the reproductive essence in the kidney can regulate the growth and development of future generations. Su Wen's theory of five zang-organs says: "The so-called five zang-organs store essence without diarrhea." "Soul Pivot is the Spirit" says: "Blood, camp, qi and spirit are also hidden in the five internal organs." The essence, qi, blood and other nutrients of the human body are all stored by the five zang-organs, and storing essence is the main physiological function of the five zang-organs, which is aimed at the kidney. Su Wen's six-stage dirty image theory says: "The heart is the foundation of life. The lung is the source of qi. Kidney, the main thorn, is the foundation of sealing and storing. Liver, don't go to extremes. Spleen, stomach, large intestine, small intestine, triple energizer and bladder are the basis of granary ... "It can be seen that the essence of the five internal organs in this paper is aimed at the whole body, in order to meet the needs of human life activities in a certain aspect. Heart is the foundation of life, that is to say, heart is the master of life. Lung is the foundation of qi, emphasizing the regulating effect of lung on whole body qi. The qi of kidney is used to store essence, that is, it is used for the whole body's life activities, not just the function of storing essence of kidney itself. There are two meanings here, that is, the kidney can not only store the surplus essence of the other four zang-organs, but also control and dominate the functions stored by its viscera, so that the five zang-organs can maintain their respective functions of storing essence, not too much or too little. That is to say, the kidney can not only store essence, but also seal life, that is, the sealing feature of the kidney is manifested in all viscera functions of the whole body. People grow up in nature, and people are corresponding to all things in nature. The sealing of kidney accords with the Tibetan nature of everything in winter and is the concrete embodiment of natural laws in human body. This is also the real connotation of kidney as a seal. "Su Wenjin Kui Yan Zhen" says: "The husband is also fine, and the body is also fundamental, so those who hide the essence will not get sick in spring." Essence is the material basis of human life activities, the basic material for promoting the growth, development and reproduction of the body, and the material basis for expelling evil spirits and resisting evil spirits. Kidney has the function of sealing the essence of five internal organs and regulating the function of storing essence of each organ, so it plays a key role in keeping the body from being hurt by external evils. Modern medicine believes that the body's resistance to diseases mainly comes from the body's immune function, including nonspecific immunity and specific immunity. It belongs to the immune characteristics of congenital factors and may have more essential significance. This immune function to diseases is similar to the function of kidney to preserve health and prevent diseases by sealing roots. The process of human aging is the process of gradually weakening the five internal organs. The growth, development and aging curve of Su Wen's On Ancient Innocence, based on female seven and male eight, fully embodies the close relationship between aging and kidney deficiency. A large number of studies on aging in traditional Chinese medicine show that kidney deficiency has a significant correlation with aging, kidney tonifying and anti-aging. As Yu Tuan said in the story of medical truth, "a strong kidney leads to a long life, while a weak kidney leads to a long life." Kidney deficiency determines the process of aging, and its essence is that kidney qi itself has a natural changing law of "abundance, abundance, uniformity and decline". With the growth of human age, kidney qi gradually declines, and the sealing function of kidney is insufficient. At the same time, it is not enough to nourish the essence of the five internal organs and regulate their respective functions of storing essence, which leads to the gradual decline of the five internal organs and the gradual decline of various organs of the body, and finally leads to the aging of the body. Although aging caused by daily kidney qi damage is the essence of the physical changes of the elderly, if we can pay attention to maintaining kidney qi and reduce man-made kidney damage, we can delay aging. In short, it is very important to protect essence and kidney, whether it is health preservation and disease prevention or delaying aging. "Kidney is the foundation of hiding" is the key to strong physique.