Surgery is recommended for obsolete anal fissure, and if the patient’s physical condition is poor enough to prevent surgery, he or she can be relieved by medication. Obsolete anal fissure is usually due to the perianal soft tissues and perianal skin are repeatedly stimulated by stool, long-term existence of breakage, ulcers do not heal. For this kind of disease, first consider the use of surgical treatment, through the surgical way to old anal fissure fissure, appear hyperplasia anal papilla and sentinel hemorrhoids excision, to achieve the purpose of treatment of the disease. If the patient’s physical condition is poor and surgery is not possible, the patient can be treated with medicines such as compound keratocyanate cream and anus tylenol ointment under the guidance of the doctor; and take a sitz bath with warm water or 1:5000 potassium permanganate solution after bowel movement to alleviate the local discomfort symptoms. In daily life, we should maintain a light diet to avoid the occurrence of dry stools and constipation. When patients with old anal fissure have symptoms, they should be treated under the guidance of professional doctors in time to avoid the symptoms getting worse and worse, which will affect their normal life.