It refers to the four major medical codes. The four medical books of Tibetan medicine are known as "masterpieces of Tibetan medicine" and are classic documents of Tibetan medicine. It is a classic that comprehensively introduces the theory and practice of Tibetan medicine, covering the basic theory, diagnostic methods, drug treatment, acupuncture and massage, epidemic prevention and treatment of Tibetan medicine. It is a precious cultural heritage dedicated by Tibetan people to the people of the world. As a classic with a long history and far-reaching influence, the four medical codes of Tibetan medicine are indispensable documents in the study of Tibetan medicine, the most complete embodiment of Tibetan medicine in the world traditional medicine, and the reaffirmation and recognition of Tibetan medicine. As an important part of Tibetan culture, the inheritance and development of the four medical codes of Tibetan medicine are not only conducive to protecting and promoting Tibetan culture, but also to promoting the integration and exchange of Tibetan culture and world culture.