The ups and downs of Yin and Yang in the four seasons of nature correspond to the functional system of the five internal organs of the human body, which further constitutes the holistic view of the unity of man and nature. "Su Wen-Jin Kui Yan Zhen" said: "The five internal organs correspond to the four seasons" just to clarify this view. East and spring in nature correspond to the acceptance of human liver system; South, summer and heart systems receive communication; Mid-long summer is related to the reception and communication of spleen system; West and autumn communicate with the lung system; The north, winter and kidney systems receive information. This reflects the overall concept of "correspondence between man and nature".

The theory of "four seasons, five zang-organs and yin-yang" is the central content of the theoretical system of Neijing, and it also embodies the concept of unity of opposites, the concept of change of life movement and the holistic view of harmony between man and nature. These viewpoints run through all aspects of the theoretical system of Neijing and become the core content of the theoretical system of Neijing. For example, "Su Wen-On Jing Mai" said: "Four changes move, and the pulse goes up and down with it." He also said: "spring is like a fish swimming in the waves;" Summer is in the skin, generally more than anything else. Four-change movement, that is, the change of climate in four seasons; The pulse goes up and down with it, that is, the pulse condition of the human body changes with the four seasons, that is, "spring floats, summer is on the skin, and so on."

If the pulse should not be four hours, the date of death can be predicted according to the relationship between the five functional systems. Therefore, "Su Wen's pulse should be subtle" says: "Yin and Yang sometimes have the same pulse for a certain period of time, but the period is lost. Knowing the pulse, the period is divided, so I know when I die. " It is the embodiment of the theory of "four seasons, five internal organs, yin and yang" that runs through the diagnostic method.

Another example is the four-season regimen, such as Su Wen's "spring qi should be the way to keep in good health"-four qi regulating the spirit, which is also the application of the theory of "four seasons, five internal organs, yin and yang" in keeping in good health.

In a word, the academic thought of the theoretical system of Neijing was influenced by ancient simple materialist dialectics. The infiltration of the theory of essence and qi not only established the materialistic view of the theoretical system of Neijing, but also laid the foundation of gasification physiology. The application of Yin-Yang and Five Elements Theory in the medical field has also promoted the establishment of TCM methodology! Explore the mysteries of life, analyze and explain the laws of human physiological activities and pathological changes, explain the relationship between man and nature, and build a theoretical system framework of traditional Chinese medicine with unified views and contact control laws, laying a solid foundation for the development of traditional Chinese medicine.