Gastroenteroscopy includes gastroscopy and enteroscopy, which requires attention to preoperative examination, fasting, intestinal preparation, and postoperative attention to diet. 1. Gastroscopy: (1) Pre-operative examination: electrocardiogram and hepatitis B 5 items need to be done before gastroscopy; those with abnormal electrocardiogram should avoid gastroscopy so as not to induce cardiovascular disease, and hepatitis B patients need to be well-protected during the examination so as not to be infected by cross-infection. (2) Fasting: Before gastroscopy, you need to fast for more than 8 hours, which is conducive to gastroscopy to provide a clear vision. 2. Enteroscopy: (1) Bowel preparation: the day before the colonoscopy, you should take laxatives as prescribed by the doctor, such as polyethylene glycol electrolyte bulk to clean up the intestines. (2) Pay attention to diet after the operation: Eat easily digestible food after the colonoscopy. If painless colonoscopy is done, the patient can eat only after the anesthesia has worn off and the patient is fully awake.