Diet of bowel cancer patients should be divided into preoperative, postoperative and chemotherapy period, the overall principle is light and soft, avoid eating too greasy and hard food. 1. Preoperative: Bowel cancer patients should try to eat soft and rotten food before operation, fully prepare the intestinal tract, start to eat semi-fluid food 3 days before operation, eat fluids 1 day before operation, take diarrhea-inducing drugs orally, and if it is rectal cancer surgery, clean enema before operation. 2. Postoperative: patients with intestinal cancer should be routinely fasted and waterless for 2-3 days after operation, and given fluids after exhaustion, and they should eat fluids and low residue semi-fluid diets, such as rice soup, porridge, rotten noodles, etc. for 3~7 days. Avoid eating too hard food, so as not to cause indigestion or bleeding at the operation site. 3. During chemotherapy: Bowel cancer patients should pay attention to light diet during chemotherapy and eat more fluid or semi-liquid food, such as millet porridge, rice soup, etc., which can better promote patients’ metabolism and reduce the burden on stomach and intestines. You can also consume fresh vegetables and fruits or fruit juice appropriately, and supplement fish, eggs and other high-quality proteins to ensure the supply of nutrition. Bowel cancer patients should reduce the intake of greasy food in daily life, avoid overeating, and develop the habit of chewing and swallowing slowly, so as to alleviate the dyspepsia caused by the shortening of intestinal tract or intestinal tumors. Patients need to actively cooperate with the doctor’s treatment plan and cultivate dietary habits according to the doctor’s suggestions, so as not to delay the course of the disease and aggravate the condition.