1, patients aged 18-80 years; 2, patients with paroxysmal and isolated atrial fibrillation (no clear evidence of etiology and organic heart disease); 3, patients with significant symptoms of atrial fibrillation, while no serious organic heart disease, heart valve disease, coronary artery disease, etc., if surgical treatment is required; 4, anti-arrhythmic drug therapy is ineffective, or can not be tolerated; 5, cardiac ultrasound examination of the left ventricular ejection fraction ≥ 30%; 6, the presence of contraindications to warfarin, antiplatelet therapy; 7, a history of thromboembolism, such as aspirin or a one-time cerebral ischemic attack; 8, previous thromboembolism. 6, the presence of contraindications to anticoagulation and antiplatelet therapy such as warfarin and aspirin; 7, previous history of thromboembolism, such as stroke or transient ischemic attack; 8, patients with recurrence of atrial fibrillation after catheter ablation; 9, have not previously undergone cardiac surgery .