1, surgical factors: In abdominal surgery, do not unilaterally pursue small incisions, not to mention the incision outside small inside large. Intraoperative should try to avoid the incision is contaminated, the incision may be contaminated in the open abdomen first do peritoneal and skin epithelial suture, reduce the incision pollution. Care should be taken not to leave a dead cavity when closing the abdomen. Use metronidazole and, saline rinse for contaminated wounds to reduce retention. Use absorbable thread or apply non-retentive sutures to close the abdomen. Can avoid long-term thread foreign body stimulation leading to abdominal wall sinus tracts. 2, postoperative factors: incisional infection, the presence of foreign bodies and improper treatment of infected wounds is the most important and basic factor in the formation of abdominal wall sinus tracts. Only incisional infection caused by wound contamination and improper use of antibacterial drugs may lead to abdominal wall sinus tracts. Improper treatment of infected wounds such as dressing change and wound expansion, failure to thoroughly remove necrotic tissues and foreign bodies in a timely manner, poor wound drainage, and retention of foreign bodies can lead to chronic abdominal wall infection, which in turn can lead to abdominal wall sinus tract formation. Sinus tracts can also be caused by untimely removal of drains and non-specific infections. Therefore, once infection occurs in abdominal surgical wounds, the possibility of sinus tract formation in the abdominal wall due to inconvenient drug changes and poor drainage should be fully estimated because of timely removal of sutures and removal of necrotic tissues from the infected area, especially for smaller incisions, which should be considered completely open. Care should be taken to remove the deep and circumferential wall threads during drug exchange. Change the medicine with a small curved tissue clamp in the sinus wall and bottom clamp, in case of difficult to kick out things with scissors cut, often can pick out the threads. 3, patient factors: obese patients are prone to fat liquefaction and complication of incisional infection, early postoperative propped drainage to prevent fat liquefaction. For patients with anemia, hypoproteinemia and combined diabetes, the systemic condition should be improved in time to control the combined disease.