This medical book named Huangdi was not actually written by Huangdi. Legend has it that it was written in the Western Han Dynasty, and the author was not alone. It started from the period of the Yellow Emperor and spread for hundreds of thousands of years, spanning many periods, and collected the words of many authors, thus forming a medical work.

This book establishes the theory of Yin-Yang and Five Elements of TCM, pulse condition theory and so on. It is also from this book that our ancestors began the theory of harmony between yin and yang.

The basic theoretical spirit of Huangdi Neijing includes: holistic view, yin and yang, five elements, viscera and meridians, etiology and pathogenesis, diagnosis and treatment, prevention and health preservation, and luck theory.

"Holism" emphasizes that the human body and nature are a whole, and the structure of the human body and its parts are interrelated.

② "Yin-Yang and Five Elements" is a theory to explain the unity of opposites between things.

③ "Zangxiang Jing" mainly studies the physiological functions, pathological changes and their relationships of the five zang-organs, the twelve meridians and Qijing.

④ "Etiology and pathogenesis" expounds whether various pathogenic factors act on human body and the internal mechanism of disease changes.

⑤ "Diagnosis and treatment" is the basic principle for TCM to recognize and treat diseases.