The skin band of anal fistula incision and hanging takes about 2 weeks to fall off automatically, and the rubber band mainly plays the role of chronic cutting. Since fistula surgery can easily damage the sphincter muscle, especially in complex fistulas, once the anal sphincter muscle is damaged, it can cause anal leakage and serious anal incontinence, so the use of hanging wire treatment has to relieve the damage caused by direct excision, and also play a chronic cutting process to gradually restore the anal muscles to adapt.