In life, we all have such a feeling, are healthy people, why some people are impatient and irritable, some people are gentle, some people are courageous, some people are weak and do not move forward? Doctors will talk about this: it is due to the body type. What is constitution? What are they? Why does it affect people so much? The author has read books on the subject and has extracted some of this knowledge for the guidance of patients. This article is for patients’ health knowledge only and not for any other purpose. The theory of TCM constitution is set up to explain these health phenomena, and it can not only guide doctors in the diagnosis and treatment of patients, but also provide guidance for patients’ health care. 1. What is constitution? Physique is a relatively stable physiological trait of a person, which is an important reference for determining the type of clinical symptoms. It is the basis for doctors to treat and patients to prevent diseases. 2. What are the body qualities? On April 9, 2009, the standard “Classification and Determination of Physical Qualities in Traditional Chinese Medicine” was officially released. The standard classifies physical qualities into nine types: pinghe, qi deficiency, yang deficiency, yin deficiency, phlegm-damp, damp-heat, blood stasis, qi yu, and special endowment. 3. What is the effect of body type on the human body? Although most of our tests are in a healthy state, there are differences in our constitutions, which determine our susceptibility to certain diseases, such as hyperlipidemia, diabetes, etc. for people with phlegm-dampness; and hyperthyroidism for people with yin-deficiency. By determining the constitution, we can make life guidance for the patient to prevent the occurrence of diseases and maintain a healthy state.