Painless gastroscopy is useful. Painless gastroscopy has the advantages of painlessness, fast examination and accuracy, and is widely used in clinical practice. 1. Painless gastroenteroscopy eliminates patients’ pain through anesthesia, and there will be no uncomfortable feeling during the examination, which is suitable for patients with nervousness and poor tolerance. The examination time is short, about ten minutes can complete the examination. 2. Diagnosis is more accurate and efficient, if the location of intestinal polyps is hidden, it is not easy to find out, painless examination of the patient is in a painless state, which allows the doctor to check more carefully so as not to miss the examination. 3. Microscopic treatment can be carried out, the examination can also be carried out at the same time minimally invasive surgery, if the polyps are found can be directly excised for treatment, to reduce the pain of open surgery. Gastroscopy can also perform hemostasis, gastrointestinal polypectomy, gastroscopic esophageal dilatation and so on.