Both gastroscopy and colonoscopy are commonly used for the examination and treatment of gastrointestinal diseases, and a normal gastroscopy or colonoscopy takes about 10-30 min. If a biopsy is needed, the examination time will increase accordingly. Gastroscopy and colonoscopy are important for unexplained gastrointestinal bleeding, gastric ulcers, peptic tumors, intestinal polyps, and other diseases. The examination time is shorter if the digestive tract is in good condition, the patient is in good condition and the operating physician is of high technical level. In most cases, for general gastrointestinal endoscopy, it can be finished in 10-30 min. In addition, for a few patients with lesions, if a gastric lesion is found and a pathological biopsy is required, the gastroscopy time will increase accordingly, possibly by 10-15 min. In addition, if the patient has a large number of intestinal polyps, the colonoscopy time will also increase accordingly, possibly by 10-30 min, or even by several hours. 1 day before the gastrointestinal endoscopy, it is necessary to pay attention to a light diet and improve preoperative related tests, such as electrocardiogram, blood routine, blood coagulation six items, etc.