The day before the colonoscopy is allowed to eat eggs, before the colonoscopy try to eat light and easy to digest food, preferably a liquid diet, you can eat some noodles, thin rice and so on. In the morning of the day of the examination, you can drink some milk, you can drink a moderate amount of water, but food is not recommended to eat again, the main intestinal preparation, commonly used laxatives such as magnesium sulfate powder, compound polyethylene glycol electrolyte dispersion, etc., generally require drinking more than 3000ml of water, so as to achieve good intestinal preparation, after drinking water recommended moderate walking, can effectively promote gastrointestinal peristalsis, can make the stool smoothly from the After drinking water, it is recommended to walk a moderate amount, which can effectively promote gastrointestinal peristalsis, which can make the stool discharged from the anus smoothly, to achieve a good effect of bowel cleansing, and to prepare for colonoscopy, which can better see the lesions of intestinal mucosa.