The main differences between colonoscopy and anoscopy are as follows: 1, the length and exploration range is different: colonoscopy is longer, about the entire colorectum can be explored, the length of 1-1.5m, while the scope of anoscopy is in 10-20cm, mainly for the rectum, the anal canal section of the intestine to check. For more than sigmoid colon, if you want to diagnose the lesion, you must go through colorectal microscopy for further examination; 2. There is a difference in operation: colonoscopy often requires specific operation by doctors in gastrointestinal endoscopy centers, while anoscopy can be performed by general surgeons or anorectal surgeons for simple operation, which is convenient, effective and fast.