 From September 2017 to September 2019, the investigators enroll consecutive patients with symptomatic atrial fibrillation AF who were scheduled for an initial catheter ablation, including paroxysmal and persistent AF.Patients are divided in to three group: paroxysmal AF in radiofrequency ablation group, persistent AF in radiofrequency ablation group, and paroxysmal AF in Cryoablation group. 