To get rid of the entanglement of diseases, get rid of the pain of diseases, preserve the essence of the human body, guide the vitality of the human body, save the people so that they can live longer and help the weak and sick to get peace, the realization of this goal can not be separated from the medical theory of ancient sages. Kong Anguo said in Preface to the Book of History: "The books of Fuxi, Shennong and Huangdi, called' Three Graves', are all about heaven, earth and people." Ban Gu's "History of Han, Art and Literature" said: "The Yellow Emperor has eighteen volumes of internal classics." Su Wen is the nine volumes in this classic, plus the nine volumes of Ling Shu, which is the number. Although years passed and dynasties changed, the scholarship of Neijing was preserved because it was passed down from generation to generation. In the teaching of doctors in past dynasties, some contents were sometimes kept secret for fear of meeting unsuitable people who could not really teach. Therefore, the seventh volume, for example, was kept secret by the officials in charge of medical education. Now, only eight volumes have been observed. Nevertheless, the text of Neijing is concise, the content is extensive, and the theory is profound and meaningful. This paper analyzes many phenomena between heaven and earth, enumerates the symptoms of various changes of yin and yang, explains the reasons of various changes, and describes and understands the omens of life and death. Therefore, after mastering the theory of Neijing, people don't need to discuss it, and their understanding of far and near things is naturally consistent; There is no need to meet, whether it is something invisible in the dark or something obviously visible and tangible, it is easy to reach an agreement. There is evidence to examine its theory and test it with therapeutic practice, and there will be no mistakes. Indeed, it can be said that it is the origin of medical theory and the theoretical basis of health preservation.

If a talented person is smart, it can help us to understand the profound truth. Of course, although a complete and thorough insight depends on smart qualifications, a correct understanding of the profound academic content of Neijing also depends on the legacy and comments of predecessors, just like people who never take the road or go in and out through the portal. However, if we devote ourselves to studying its spiritual essence, exploring its subtle meaning and profound truth, and if we know and master its essence, we can reach a superb situation. Therefore, as long as an action is effective, just like the help of ghosts and gods in the dark, outstanding doctors who are famous all over the world will emerge from time to time. There were Qin Yueren in Zhou Dynasty, Chunyu Kun in Han Dynasty, Zhang Zhongjing and Hua Tuo in Wei and Jin Dynasties. They have mastered the subtle theories in the book, and they can constantly innovate and develop their wonderful uses from generation to generation, help the people extensively, and make the medical cause as prosperous as flowers and green leaves. The reputation of these doctors is commensurate with their practical skills. These are probably the remarkable achievements of Su Wen's upbringing and enlightenment, and they are also funded by God!