The process of anal fistula surgery mainly has anesthesia, determine the internal mouth, explore the fistula and excision of fistula, hanging line, filling gauze, drainage and so on several aspects. There are three common clinical anal fistula surgery, anal fistula incision, anal fistula resection, fistula hanging line, surgical operation process is slightly different, specific as follows: 1. Anesthesia: mostly general anesthesia, take the prone position or truncated position after anesthesia, suitable for three kinds of surgery. 2. Determine the internal orifice: mainly to clarify the internal and external orifice and the direction of the anal fistula. 3. Probing the fistula as well as removing the fistula, hanging thread: anal fistulotomy is mainly to scrape the granulation tissue and necrotic tissue in the wall of the fistula under the guidance of the probe. Anal fistulotomy is along the outer wall of the fistula, completely removing the fistula up to the healthy tissue, the wound is not sutured. Fistula hanging is inserted from the outer mouth of the probe, along the direction of the fistula from the inner mouth through the outer mouth of the probe tied to a rubber band, through the inner mouth, from the anus out, the inner and outer mouth of the two ends of the band tightened ligature. 4. stuffing gauze: mainly to play the role of compression of blood vessels. 5. Drainage: through the drainage can be inside the pus and necrotic tissue, secretion drainage out, this is mostly seen in high complex anal fistula surgery. The above is the general process of anal fistula surgery, different conditions, the choice of surgery is different. We need to follow the advice of professional doctors to give reasonable treatment.