Huangdi Neijing is one of the four classic works of Chinese traditional medicine (Huangdi Neijing, Difficult Classic, Treatise on Febrile Diseases and Shennong Herbal Classic), and it is the earliest medical classic in China's medical treasure house. It is a medical masterpiece that studies human physiology, pathology, diagnostics, therapeutic principles and pharmacology. Theoretically, the theories of yin and yang, five elements, pulse condition, Tibetan image, meridians, etiology and pathogenesis, symptoms, diagnosis, treatment, health preservation and luck are established. His medical theory is based on China's ancient Taoist theory, which embodies China's ancient thought of harmony between man and nature. There are props of the same name in Fantasy Westward Journey.

Huangdi Neijing includes Suwen 8 1 and Lingshu 8 1, each with 9 volumes. It made a systematic theoretical summary and understanding from the aspects of yin and yang, five elements, correspondence between man and nature, five movements and six qi, viscera and meridians, pathogenesis, diagnosis, treatment principles, acupuncture and other aspects, combined with the achievements of philosophy and natural science at that time. It still has guiding significance in diagnosis and treatment.