Initial anal fistula without an external opening can be treated by anal fistulotomy or anal fistula hanging wire surgery and other methods. There is no internal or external mouth of the fistula is called blind fistula, can be divided into internal blind fistula and external blind fistula. External blind fistula refers to the anal fistula without an external mouth, in this case, according to the patient’s specific situation can choose to perform anal fistulotomy or anal fistula hanging line surgery to treat. Patients need to keep the perianal skin clean after surgery, local skin itching can not be scratched with fingernails to avoid skin damage and infection. Postoperative should be under the guidance of the doctor every morning and evening and after the stool with 1: 5000 potassium permanganate solution sitz bath or Chinese medicine sitz bath, can relieve local pain, but also conducive to the dissipation of local inflammation, absorption. In order to prevent anal stenosis, patients can use the index finger to expand the anus once a day under the doctor’s guidance for 5~10 days after the operation. After the operation, it is advisable to eat light, easy to digest food, and keep the bowel movement. It is recommended that patients who are diagnosed with anal fistula should go to regular hospitals for treatment in a timely manner and follow the doctor’s treatment advice to avoid delaying the aggravation of the condition.