Shu State and Zheng Ross in Huangdi Neijing. Huangdi Neijing is the earliest extant work of TCM theory, which has a far-reaching influence on the establishment of TCM theory in later generations. Shu Wuguo and Zheng mentioned that doctors should avoid five kinds of faults and four kinds of faults, and warned doctors to analyze the causes from pathological and psychological aspects to relieve patients of diseases. Therefore, Shu Wu Guo and Zheng Ross in Huangdi Neijing are the earliest masterpieces involving the professional quality of doctors in the medical field.