Arrhythmia is a common cardiovascular disease, and the simplest way to confirm the diagnosis is with an electrocardiogram. The ECG has been available for hundreds of years and can be done in hospitals at all levels, including rural health centers, throughout the country and the world, and can basically confirm the diagnosis of arrhythmia. The second diagnostic method is the ambulatory ECG. Currently, there are 24-hour ambulatory ECG and 48-hour ambulatory ECG, which are mainly used to capture what cannot be captured in the ordinary ECG, such as arrhythmias that occur at night. The third diagnostic method is electrophysiological examination, which is relatively less invasive and can be done in an outpatient setting for esophageal electrophysiology. Complex arrhythmias, on the other hand, often require hospitalization and can generally be confirmed by intracardiac electrophysiological examination through catheter insertion into the heart in level II and IIIA or higher hospitals.