The purpose of this study is to compare single groin puncture and bilateral groin puncture during AF ablation procedure. The investigators will compare 1) the degree of patients' discomfort during hemostasis by questionaire, 2) procedure time, 3) complication rates, and 4) 1-year clinical recurrence rate of AF.

Inclusion Criteria:

1. Patients agreement of consent
2. Patients who age more than 19
3. patients who undergoing catheter ablation of atrial fibrillation
4. Patients who are not vascular disease

Exclusion Criteria:

1. patients who do not agree with study inclusion
2. persistent AF
3. Patients with vascular disease or venous anomaly
4. Patients with structural abnormality of the heart