The preparations that need to be made before doing gastroscopy as well as colonoscopy include dietary preparations, intestinal preparations, auxiliary examinations, etc., which need to be analyzed specifically. 1. Dietary preparation: the day before gastroscopy and colonoscopy, you need to eat easy-to-digest food, and on the day of the examination, you need to keep fasting, which is conducive to endoscopic observation. 2. Bowel preparation: if you need to perform enteroscopy, then you need to take drugs to promote the discharge of intestinal contents, such as polyethylene glycol electrolyte bulk and other drugs, these can improve the accuracy of the examination. 3. Auxiliary examination: before performing gastroscopy and enteroscopy, it is also necessary to exclude some serious underlying diseases, perform blood routine, electrocardiogram and other tests to prevent accidents when doing gastroscopy and enteroscopy. If patients need to undergo gastroscopy and enteroscopy, it is recommended to seek medical treatment in time and make adequate preparation under the guidance of doctors to promote the smooth progress of the examination.