Painless electronic colonoscopy is a combination of painless means of anesthesia and electronic colonoscopy to examine the colon with high definition, high resolution and painlessness. As a painless technology, patients can complete the entire examination and treatment process in a painless state, sleep state, the examination takes 15 to 30min, for the examination of patients with a longer time, such as the examination of patients after surgery, more obese patients, usually a little longer. Painless electronic colonoscopy is both a means of examination and treatment. In order to observe the intestinal tubes in the area from the anus to the ileocecal valve, painless electronic colonoscopy inserts an electronic colonoscope from the anus in order to determine whether the intestinal tubes grow polyps, erosions, inflammation, congestion, edema, as well as cancerous lesions. As a therapeutic tool, tissue can be taken through the electronic colonoscope for pathologic biopsy, polypectomy, mucosal resection, and other operations. Painless electronic colonoscopy combines the painless means of anesthesia and electronic colonoscopy to examine the colon with high definition, high resolution, and painlessness. It is recommended that painless electronic colonoscopy be performed under the guidance of a physician to avoid discomfort.