Radiofrequency ablation (RF) of atypical ALF is challenging. This report describes the RF strategy and prognosis of atypical ALF after cardiac surgery. Female, 71 years old. The patient underwent surgical mechanical mitral valve replacement, tricuspid valvuloplasty, and left atrial appendage ligation. ALF repeatedly attacks. We performed RF from the “two” tricuspid rings respectively and from the superior vena cava to the inferior vena cava. The rhythm changed to sinus rhythm after electrical cardioversion. Three months later, the structure and function of the heart were significantly improved and sinus rhythm maintained. Conclusion: Phased RF in atypical ALF patients is effective and beneficial.