Colon cancer patients generally have to do intestinal preparation before surgery, including removal of stool in the intestine and giving oral antibiotics, vitamins and other drugs, the purpose of which is to prevent postoperative infections, bleeding and other complications. The specific intestinal preparation includes oral intestinal antibacterial drugs, control diet, clean intestine, oral vitamin K, as follows: 1. Oral intestinal antibacterial drugs: oral intestinal antibacterial drugs instead of systemic application of 2.Control diet: generally change to liquid diet 2-3 days before surgery, and start fasting one day before surgery. 3.Clean intestine: for patients with intestinal cancer combined with intestinal obstruction, oral laxatives should be taken to discharge stool before surgery to achieve the effect of clean intestine. 4. Oral vitamin K: Since intestinal antibacterial drugs cause intestinal vitamin K malabsorption, therefore, while taking antibacterial agents, oral vitamin K should be taken to prevent vitamin K deficiency, which leads to coagulation disorder and induces bleeding.