The causes of frequent premature contractions may be physiological or pathological. For physiological reasons, strenuous exercise, mental stress, and consumption of strong tea and coffee are common causes of frequent premature beats. For young people who stay up late at night, they are also prone to frequent premature beats, and 24-hour ambulatory ECG monitoring is recommended. In case of frequent premature beats, the symptoms can be improved without any special treatment if the related triggers are avoided. In addition, frequent premature beats can also be seen in patients with organic heart disease. In patients with acute coronary syndrome, acute ischemia and hypoxia of cardiomyocytes can cause disturbances in the electrical activity of cardiomyocytes, resulting in premature ventricular beats, ventricular tachycardia, and even ventricular fibrillation. In this case, it is recommended to improve electrolyte disorders, improve myocardial ischemia, and give anti-arrhythmic drugs for comprehensive treatment. For acute ventricular fibrillation with hemodynamic instability, electric cardioversion therapy is required.