The collision between modern medical science and the Tang Dynasty traditional Chinese medicine system and feudal cognition; the desire to go home and the decision to take root in medical practice; the worry about exposing one's identity. External conflicts: the conflict between the lack of medical resources and the need for treatment; the ideological dispute with conservative doctors (including some officials of the Tai Hospital); dealing with the medical needs and political coercion of the powerful class; the challenge of fighting against large-scale infectious diseases and difficult diseases.