Colonoscopy will cause some stimulation to the gastrointestinal tract, so after colonoscopy, patients should first try to eat a light diet, which can be more warm, soft, easy to digest, liquid food, should avoid too cold, too hot, spicy and stimulating, greasy, indigestible diet, quit smoking, quit drinking, do not overeat, so as not to cause stimulation to the gastric mucosa, aggravate the intestinal mucosa congestion, edema, causing abdominal distension and discomfort. If the patient has not undergone colonoscopic treatment, such as colonoscopic polypectomy, etc., he can eat about 2 hours after the examination, after the abdominal distension disappears. On the day after the examination, fluid and less residue diet should be consumed, such as egg flower soup, lotus root powder, kudzu powder paste, millet porridge, oatmeal porridge, egg batter, etc. Egg custard, boiled noodles or noodle slices can also be consumed, alcohol should be avoided, milk, soy milk, juice, etc. can be consumed, after which bread, steamed buns, rice, etc. can be gradually added to gradually resume normal diet. If the patient has undergone colonoscopic treatment, he should pay attention to bed rest after treatment, and he should fast 1-2 days after treatment, and he can resupply nutrition and water through intravenous. 2-3 days later, he can eat appropriate dregs-free liquid food, and avoid coarse food, vegetables, fruits, etc. About 4 days after surgery, semi-liquid food, such as millet porridge, black rice porridge, etc., can be eaten, and gradually over to ordinary meals.