Premature beats are referred to as premature beats. It is a heart beat caused by a premature impulse from an ectopic pacing point and is the most common cardiac arrhythmia. It can occur on the basis of sinus or ectopic (e.g., atrial fibrillation) rhythms. It may occur sporadically or frequently and may occur irregularly or regularly after each or several normal beats, forming a diphasic or associative premature beat. According to the site of origin, there are four types: sinus, atrial, atrioventricular junction and ventricular. Among them, ventricular premature beats are the most common, followed by atrial, and junctional are less common. Sinus premature contractions are rare. Premature beats can be seen in normal subjects or in patients with organic heart disease, commonly coronary artery disease, rheumatic heart disease, hypertensive heart disease, cardiomyopathy, etc. Premature beats can also be seen in patients with quinidine, procainamide, digitalis or antimony poisoning, low potassium levels, mechanical stimulation of the heart during cardiac surgery or cardiac catheterization, etc. Premature beats are divided into “functional premature beats” and “organic premature beats”. Patients with functional premature beats heal well, so they should eliminate their worries and maintain optimism. The prevention of premature beats should pay attention to the following points: 1. First of all, we should maintain a regular life, pay attention to the combination of work and rest, and get enough sleep. Don’t stay up too late, don’t watch TV or sit in front of the computer for a long time. 2. Take appropriate physical exercise, such as walking and tai chi. 3, to quit smoking and avoid drinking a lot of alcohol, strong tea, coffee, etc., because tobacco, alcohol, strong tea, coffee have the role of excitation of the heart nerves, smoking, drinking alcohol is also a risk factor for coronary heart disease. 4, to maintain emotional stability, emotional tension and mood swings are the main cause of “functional premature beats”. ”Premature beats caused by organic lesions should be treated, and anti-arrhythmic drugs should be taken under the guidance of a physician, and the treatment should be patient, so as not to change the drugs frequently.