Syncope is a sudden onset of temporary, widespread cerebral blood supply deficit resulting in a brief loss of consciousness. It is mostly caused by somatic factors, but can also be secondary to impaired blood circulation to the brain. The elderly, sedentary after intense exercise, etc. are prone to fainting. To prevent easy fainting, first of all, according to the origin of the fainting disease to prevent symptomatic: a. Cardiogenic syncope Due to cardiac arrhythmias, myocardial infarction and other reasons caused by a rapid reduction in the amount of heart beat output. It is particularly common in atrioventricular block and ventricular paroxysmal tachycardia. It is important to prevent the onset of coronary heart disease in advance. Reflex syncope This is a common type of syncope. 1, due to increased vagal tone. 2, postural syncope, mostly occurs when the prone position is turned to upright. 3.Carotid sinus allergic syncope. Urinary syncope Daily prevention is as follows: 1, adhere to the principles of scientific and systematic training, to avoid overexertion, excessive tension and other sports diseases. 2, those who participate in long and strenuous sports programs must be trained practitioners. 3, disease recovery and older people to participate in sports must be in accordance with the exercise prescription. 4.Avoid prolonged training and competition in summer under high temperature, high humidity or windless weather conditions. 5, to carry out long-distance exercise to replenish sugar, salt and water in a timely manner. 6, should not be under closed air for long distance swimming, underwater swimming sports should have safety supervision measures. 7, athletes should be regular physical examination, especially before major competitions and high-intensity training. 8.Practitioners who have experienced syncope should do a comprehensive examination to clarify the causes and avoid further syncope. 9.Practitioners and coaches should have the ability to prevent and simply deal with syncope in sports.