Pre-operative preparation for colon cancer is as follows: 1. Improve colonoscopy results and pathology results, do abdominal CT to clarify the tumor site, and in some cases, even do imaging to clarify the tumor location. Do physical examination in all aspects, such as chest X-ray, electrocardiogram, as well as liver function, electrolytes, kidney function, and other pulmonary function tests. These examinations should be perfected, and abnormal examinations should be handed over to relevant departments to achieve the best conditions. 2. intestinal preparation is to start eating liquid diet one day before surgery, and antibiotics will be applied prophylactically before surgery, and laxatives or enemas should also be prepared before surgery, which are mainly laxatives at present, and enemas are rarely used. 3. psychological preparation, comforting patients to ensure good rest before surgery. 4. preventing various kinds of diseases such as cold or Similar diseases appear.