Electronic colonoscopy and colonoscopy are different, and now it is generally believed that electronic colonoscopy and colonoscopy are the same, both are soft type lower gastrointestinal endoscope, both are electronic fiber optic conduction, electronic display screen direct observation of the rectum, colon and ileocecal, ileal end of the intestinal cavity internal situation. The original rigid colonoscope is no longer used because of the restricted observation and the pain of the person being examined. Examination site: electronic colonoscope or enteroscope: examination is through the anus to insert the colonoscope into the ileocecal and ileocecal end, from the mucosal side to observe the end of the ileum and ileocecal, colon, rectum lesions of the examination method, is the best choice for the diagnosis of large intestinal mucosal lesions, can observe the end of the ileum and small changes in the mucosa of the large intestine, the image is clear and realistic. Second, the examination time: electronic colonoscopy or enteroscopy: examination generally takes about 10 ~ 20 minutes, such as the discovery of suspicious lesions need to perform pathological examination, its time will be lengthened. Third, the examination comfort: now electronic colonoscopy or colonoscopy are feasible under awake state and anesthesia examination, anesthesia is examined by the painless feeling, high comfort, small side effects and small damage; examination process need to constantly inflatable aspiration for examination, awake patients will exist some discomfort.