Before painless gastroenteroscopy, attention should be paid to diet, intestinal cleansing, informed consent and relaxation. 1. Pay attention to diet: fast for 8 hours before gastroscopy, those with delayed gastric emptying should fast for a longer period of time, and those with pyloric obstruction should have gastric lavage before examination. Enteroscopy 1 day before the liquid diet, fasting in the morning of the same day. 2. Intestinal cleansing: enteroscopy requires intestinal cleansing, which can be done by drinking laxatives and clean enema 6-8 hours before the examination. 3. Informed consent: Sign the informed consent form, inform the doctor of your past medical history, and find out if there are any indications and contraindications for the examination. 4. Relaxation: relax before the examination, eliminate fear, and actively cooperate with the examination. If the diagnosis of gastrointestinal symptoms and related diseases is not clear, the patient should go to a general hospital in time to improve the relevant examinations, to clarify the cause of the disease and to carry out relevant treatment if necessary.