All diseases are born in qi, and the movement of qi is the basic form of movement, and the movement disorder of qi is the most fundamental reason for the occurrence of diseases, among which Ying and Wei disorder is the most important form of qi movement disorder. First, the meaning of Ying and Wei Qi 1, Ying Qi is produced by the essence of water and grain, which runs in the veins and has the ability to nourish the whole body, fill the blood vessels and produce blood gas. 2.Wei qi is the qi that is generated from the strong part of water and grain essence, which runs outside the veins and has the function of nourishing the flesh of the skin, regulating the opening and closing of the body and protecting the organism. Second, the harmonization of Ying and Wei is the basis of disease prevention and treatment “Ying and Wei follow each other, Yin and Yang have been and; Ying and Wei disorder, all diseases begin to arise. Harmonization of Ying and Wei is the rule of clinical treatment. The main physiological functions are: (1) to protect the surface of the body against external evil; (2) to fumigate the body and warm the skin and hair; (3) to control the opening and closing of the couples and the excretion of sweat. As stated in Ling Shu. This collection of “Wei Qi, so warm the flesh, fill the skin, fat couples, the Division of the opening and closing also”, and “Wei Qi and the flesh of the flesh to solve the profit, the skin to adjust the soft, couples to dense carry on. The physiological characteristics and functions of the Wei Qi decided that the Wei Qi should be “solid”, should be “warm”. 2, “Ying in the pulse” the main internal guard is Yin, its physiological functions are mainly: (1) nutritional role, such as “Su Wen. The theory of paralysis said: “Rong, the essence of water and grain, and regulate the five organs, and sprinkled in the six internal organs.” (2) Transformation of blood. For example, “Ling Shu. The evil guest” said: “Ying Qi, secrete its fluids, injected in the veins, transformed into blood. The physiological characteristics and functions of Ying Qi determine that Ying Qi should be “nourished” and “converged”. 3, “Ying, Wei” gas although each has a different nature of yin and Yang, but also mutual love and dependence, the two that are opposed to each other, but also for each other, harmonious coexistence, to maintain a certain balance and coordination relationship. In order to maintain the normal couples opening and closing and the ability to defend against external evil, as the “Su to. Yin and Yang should be like the great theory of the cloud: “Yin within, Yang’s guard also, Yang outside, Yin’s make also”. 4, the close physiological relationship between the Ying and the Wei, pathology also affect each other, one side of the disease will be involved in the other side and suffer from both. If the external wind evil, Wei Qi tends to table to resist the evil can lead to “Wei strong Ying weak”; or Wei Qi table deficiency, easy to be attacked by evil, will be attacked by Ying; or Ying Yin internal injury or Ying Yin deficiency, can not internal sword within the guard, will be leaking out of Wei; at the same time, because of the weakness of Ying can not help Wei, so that the Wei Qi is weak. All of these can lead to a loss of harmony between Ying and Wei. Therefore, in the process of clinical illness, harmonizing Ying and Wei and unblocking Ying and Wei is the key to treating the disease. In a word, both Ying and Wei Qi are made of water and grain essence, Ying from the Yin Qi of the earth, Wei from the Yang Qi of the sky, Ying travels in the veins, Wei travels outside of the veins, Ying circumference is endless, fifty and the General Assembly, Yin and Yang are coherent, like a ring without end.