Painless colonoscopy is painless and takes about 20 minutes to operate, depending on the operator’s operation and the patient’s examination. Painless colonoscopy is based on anesthesia in patients for electronic colonoscopy, that is, the use of small diameter mirror body from the anus to insert, into the intestinal tract, the microscopic images presented on the monitor, the intestinal tract for multi-angle, all-round examination, if necessary, can be microscopically extracted tissues, a variety of intestinal disorders to assist in the diagnosis. The operation process of painless colonoscopy requires a comprehensive examination of the intestinal tract, and the general examination time is about 20 minutes, which can be shortened or lengthened according to the specific conditions of the patients during the examination. Painless colonoscopy needs to pay attention to the combination of heart, brain, lung disease, abdominal cavity adhesion serious patients need to be careful to choose, it is recommended that under the guidance of the doctor to choose the appropriate way of examination.