Early electrocardiographic repolarization refers to an electrocardiographic phenomenon such as ST-segment elevation in people with a healthy appearance and no cardiac morphologic abnormalities. Early electrocardiographic diplopia was previously considered to be a normal variant of electrocardiogram, but recent studies have found that it is closely related to malignant arrhythmias. Early repolarization is divided into type I, type II and type III. Type III early repolarization has the highest risk of ventricular fibrillation and is often accompanied by sympathetic electrical storms, which has the highest morbidity and mortality rate, followed by type II, and type I has the lowest morbidity and mortality rate. In addition to electrocardiographic repolarization variability and ventricular depolarization asynchrony, early repolarization pathogenesis is also considered to be related to vegetative neuromodulation disorders. Early repolarization mostly occurs in young people, vagal excitability increases, the vast majority of sinus bradycardia, sleep ST segment elevation is more pronounced, sympathetic excitation or exercise caused by heart rate increase, ST segment back down to the equipotential line. Patients with early repolarization should pay attention to rest and maintain emotional stability. The aim of early repolarization therapy is to prevent the emergence of ventricular fibrillation and to reduce the incidence of sudden cardiac death in patients. Its treatment mainly includes antiarrhythmic medication, implantation of cardioverter-defibrillator, radiofrequency catheter ablation and so on. Therefore, if early repolarization appears on the ECG, it is recommended to consult a doctor to identify the cause of the problem and provide targeted treatment or therapy.