Premature beats have many causes and usually do not affect life expectancy. However, frequent ventricular premature contractions can easily lead to malignant arrhythmias, which may pose a risk of sudden death. Premature beats are defined as preterm contractions of the heart originating from ectopic pacing points other than the sinus node and can be classified as atrial, ventricular, or junctional premature beats. Atrial premature contractions and junctional premature contractions are common in physiological conditions such as emotional stress, nervousness, fatigue, etc. They generally do not require treatment and do not affect life expectancy. In contrast, premature contractions due to digitalis, quinidine, potassium deficiency and cardiac surgical stress can be cured by stopping the medication and giving the appropriate symptomatic treatment. In contrast, frequent ventricular premature beats can easily trigger ventricular tachycardia and even ventricular fibrillation, with the risk of sudden death. Therefore, premature beats caused by coronary artery disease and cardiomyopathy have less impact on life expectancy after correction of myocardial ischemia to prevent malignant arrhythmias. Patients with premature beats should avoid coffee, alcohol and smoking as much as possible, actively seek medical consultation to clarify the causes and triggers of the onset, and actively treat the primary cause and symptomatic treatment.