It is a wonder that doctors of traditional Chinese medicine could cure patients without any equipment. The four diagnostic methods of traditional Chinese medicine consist of observing, listening and smelling, inquiring and pulse taking. Observing indicates that doctors directly watch the outward appearance to find out a patient's condition. Listening and smelling refers to listening the sound and smelling the odour of the patient, which is helpful for doctors to collect messages to diagnose. Inquiring suggests that doctors question the patient so as to know the symptoms and previous treatments. Pulse taking refers that doctors measure the pulse condition of patients to know their internal change.