Atrial fibrillation (AF) is one of the most common clinical arrhythmias, and its ECG physical characteristics are absolute inequality of RR intervals, disappearance of P waves, and atrial excitation cycles generally <200ms (>300bpm). The incidence of atrial fibrillation increases with age, and according to the survey, the incidence of atrial fibrillation in the general population is about 0.4% to 1%, and the incidence in elderly people over 80 years old can exceed 8%. Atrial fibrillation not only affects the quality of life of patients, but also can lead to stroke, heart failure and even death. The classification of atrial fibrillation is of great help in the selection of therapeutic measures and is divided into 5 major categories: 1. First diagnosed atrial fibrillation: patients are diagnosed with atrial fibrillation for the first time; 2. Paroxysmal atrial fibrillation: atrial fibrillation can generally terminate itself within 48 hours and lasts up to 7 days; 3. Persistent atrial fibrillation: atrial fibrillation that lasts more than 7 days, or atrial fibrillation that requires medication or electrical cardioversion to terminate; 4. Prolonged persistent atrial fibrillation: atrial fibrillation that lasts more than 1 year and requires rhythm control therapy; 5. Permanent atrial fibrillation: atrial fibrillation that fails with medication or electrical cardioversion and the presence of atrial fibrillation is accepted by both the physician and the patient. Treatment of atrial fibrillation includes heart rate control, prevention of thromboembolism (stroke), and rhythm control (restoration of normal heartbeat). For primary, paroxysmal persistent, and prolonged persistent AF, medications or catheter ablation should be used to help restore sinus rhythm (normal heartbeat) as much as possible. In patients with permanent AF, anticoagulation therapy should be actively used to prevent thrombosis (stroke) and antiarrhythmic drugs to control the ventricular rate. Catheter ablation is one of the most important measures to restore sinus rhythm (normal heartbeat) in patients with atrial fibrillation. “Catheter ablation should be performed in patients with paroxysmal atrial fibrillation with significant symptoms that are not treated with antiarrhythmic drugs or are intolerant; catheter ablation should also be performed in persistent atrial fibrillation with a shorter history, ineffective treatment with at least one drug, and no significant organic heart disease; for persistent atrial fibrillation with a longer history and organic heart disease, catheter ablation can For persistent atrial fibrillation with a long history of organic heart disease, catheter ablation can be used as a measure to maintain sinus rhythm or to prevent recurrence”. In conjunction with treatment guidelines for atrial fibrillation, the presence of a thrombus in the left atrium is a contraindication to catheter ablation. Catheter ablation is also generally not recommended for patients with atrial fibrillation of very long duration, with a left atrial diameter greater than 50 mm, and who are very old (>70 years for women and >75 years for men).