The method of diagnosis in Chinese medicine is to combine the four diagnostic methods of “looking, smelling, questioning and cutting”. Since disease is a complex process and its clinical manifestations are reflected in many aspects, it is necessary to combine the diagnostic methods in order to obtain the clinical information required for diagnosis in a comprehensive and exhaustive manner. The four diagnostic methods of looking, smelling, asking and cutting are from different perspectives of examining the condition and collecting clinical information, each with its own unique method and significance, and cannot replace each other, so Chinese medicine emphasizes the combination of diagnostic methods. 1. The diagnosis of looking is to collect information from patients by observing their body shape, color, hair, and tongue to help diagnose. The most important is tongue diagnosis, including tongue coating, tongue color, tongue shape and other diagnosis. 2. Smell diagnosis is to observe some secretions of the patient, such as sputum, saliva, feces, etc. to collect information about the patient. 3. Questioning is to ask the patient about the main discomfort symptoms and the accompanying secondary symptoms to make a judgment of the disease. 4. Pulse diagnosis is to detect the patient’s pulse frequency and beat characteristics by taking the pulse to help diagnose the disease. When diagnosing a disease, TCM practitioners emphasize on the four diagnostic methods and analyze the collected information together to identify and treat the disease. It is recommended that patients in need of Chinese medicine diagnosis and treatment should go to regular hospitals and be diagnosed by professional Chinese medicine practitioners, rather than making blind judgments on their own in order to avoid making mistakes in their illnesses.