The day before the gastroenteroscopy examination needs to do a good job of dietary preparation, intestinal preparation and other preparations. 1. Dietary preparation: the day before the gastroenteroscopy need to maintain a light diet, try to eat little or no residue food, such as steamed bread, rice, avoid eating leeks and other foods rich in dietary fiber. Before the examination, you need to abstain from food and drink for eight hours, which helps to promote the emptying of food in the stomach and enables the doctor to clearly and directly observe the patient’s stomach. 2. Bowel preparation: the day before the colonoscopy, you should use polyethylene glycol electrolytes and other drugs to clean the bowel until the discharge of watery stools. 3. Other preparations: patients who need to take aspirin and other anticoagulant drugs should consult the doctor whether they need to stop taking the drugs, so as to avoid affecting the gastrointestinal microscopy operation (e.g. gastrointestinal microscopy mucosal biopsy, etc.). Gastroenteroscopy preparation should be carried out under the guidance of the doctor.