The difference between electronic sigmoidoscopy and colonoscopy is mainly in terms of imaging effect, examination significance and endoscopic treatment. If the imaging effect of electronic sigmoidoscopy is clearer, it has more significance for colon cancer diagnosis and feasible microscopic treatment. 1. Imaging effect: electronic sigmoidoscopy can transmit the pattern to the computer through the electronic camera at the front end of the colonoscope, and display it on the screen intuitively, so that it can better observe the subtle changes of the mucosa. 2. Examination significance: electronic sigmoidoscopy is the first choice examination for diagnosing intestinal diseases, especially intestinal cancer and precancerous lesions. 3. Endoscopic treatment: More therapeutic measures can be performed endoscopically, such as polypectomy, localization of lesion markers, and special staining treatment. For the choice of colonoscopy, it is recommended to ask your doctor to choose the appropriate means of examination according to your personal situation.