A 70-year-old person with clear contraindications such as active asthma, coronary atherosclerotic heart disease with still obvious discomfort, severe anemia or even shock, and with intestinal perforation is usually not allowed to do painless colonoscopy. If the physical indicators are within the normal range, it is possible to do painless colonoscopy. Painless colonoscopy is under anesthesia, the use of enteroscopy on the anus, rectum, colon area of the lesions to make the examination, the detection of organic lesions has an important role. If the 70 year old person has no obvious abnormality in the results of ECG, chest X-ray and laboratory tests, or if there is no contraindication to colonoscopy as assessed by the doctor, and if there is no contraindication to anesthesia as assessed by the anesthesiologist, painless colonoscopy can be carried out. When 70-year-old people need to do painless colonoscopy, it is recommended to go to the gastroenterology department of the hospital for consultation, and the professional doctor will judge whether it is possible to do painless colonoscopy.