Internal medicine I is the teaching of various theories. On the basis of mastering the basic theory of internal medicine and the basic concept of diagnostics and the basic technical operation of internal medicine, learn and master the etiology, occurrence and development rule, pathology, clinical manifestations, diagnostic points, differential diagnosis, prevention and treatment principles, prognosis and other internal medicine knowledge of diseases in cardiology, respiratory medicine and nephrology. The key contents of internal medicine Ⅰ include: common diseases in internal medicine, introduce their causes, pathology, clinical manifestations, diagnosis and differential diagnosis, prevention and treatment, and prognosis; the learning difficulties of this course are the combination of basic and clinical, and students should grasp the key points on the basis of a comprehensive understanding of their contents in order to be applied in clinical practice.