Why is the persistent pre-sacral sinus infection of perineum not effectively treated? The clinical manifestation is a sinus tract in the presacral area, which often flows purulent discharge because of the formation of the sinus tract, and there is usually no clinical fever, pain, redness or swelling. However, the pre-sacral secretion of pus around the clock brings infinite pain to patients, and male patients have no choice but to bring sanitary napkins all day long and suffer great physical and mental trauma. According to the patients from other provinces (Liaoning, Anhui, Hebei, etc.) who have been cured, before contacting me, the disease ran through many hospitals, but nothing could be done. I believe that the treatment of this disease is not complicated, and the reason for not getting effective treatment before is that I have not mastered the idea and approach of surgical treatment of this disease. It is necessary to share the experience of treatment so that patients can get early cure. Ideas: 1. The tumor must be early. For the treatment of this disease, the first step is to understand the past medical history, because the patient is operated for the first time for the tumor, and must understand whether the tumor has recurrence at present. If the tumor recurs combined with infection, surgery is very difficult to cure. If the tumor has not recurred, the simple presacral infection can be cured. 2. For some post-operative follow-up radiotherapy, the dose of radiotherapy must be understood. If high dose radiotherapy leads to presacral necrosis, the tissue is not alive is also difficult to treat. However, most of the postoperative patients are adjuvant radiotherapy, which is usually curable. 3. It is necessary to access to the top of the sinus tract. Many hospitals treat patients, mostly with clearing around the sinus tract, which is ineffective. It is necessary to access the deep part of the sinus tract and get rid of the infected foci. 4. If necessary, a combined abdominal and perineal approach is required. For deeper sinus tracts must abdominal synergy before accessing the pre-sacral infected area. Access: 1. Application of anterior sacrococcygeal transverse curvilinear incision. The anterior sacrococcygeal transverse arc incision is used to safely and effectively access the anterior sacral infection site. This incisional approach not only does not injure the surrounding tissues, but also exposes the lesion well. 2. The laparotomy group must follow the centerline of the sacrum and the anterior sacral rendezvous. After the patient has undergone laparotomy, the pelvic cavity will form an adhesive scar and the bilateral ureters and iliac arteries will not be easily revealed, except for perception by hand, it is best to enter the presacral along the sacral centerline, which has the least variation in location. In the past, there were patients with combined abdominal perineal surgery, and most of them did not succeed because of the fear that the pelvic floor vascular ureter did not meet with the presacral division. 3. The application of the large omentum with the tip. How the patient has abundant large omentum, which can be freed to enter the presacral area, has a compressive hemostatic effect, inflammatory absorption effect, and on the other hand, prevents small intestine internal herniation.