Rectal cancer surgery belongs to the fourth level of surgery within the surgical classification, which is the most complicated surgery and should be a major surgery. The main complications of surgery are as follows: 1. intraoperative bleeding, especially presacral hemorrhage, is a complication that can easily cause life-threatening, and this kind of hemorrhage is not well controlled and can be life-threatening on the operating table; 2. intraoperative damage to ureter, bladder, vagina and adjacent large blood vessels, causing postoperative Serious complications; 3, postoperative anastomotic bleeding, anastomotic fistula is also a common complication; 4, postoperative intestinal obstruction, many patients will have abdominal distension, abdominal pain, anal stop exhaustion, defecation and other obstructive symptoms after surgery; 5, postoperative sexual function and urinary disorders. All of the above are complications that are easily caused after surgery.