Normally, a colonoscopy requires laxatives for bowel cleansing in order for the results to be accurate, but if the patient suffers from intestinal obstruction and other contraindications to taking laxatives, enemas can be considered to clean the bowel. Enteroscopy is the insertion of the enteroscope from the anus, along the rectum to finally reach the ileum, can be observed on the mucosa of the rectum, colon and other parts of the rectum, can be found in congestion and edema, erosion, ulcers or tumors and other diseases, at the same time, can be suspected parts of the biopsy pathology, in order to clarify the nature of the lesions. During colonoscopy, for the sake of the accuracy of the results, patients are asked to take laxatives (the most commonly used is polyethylene glycol electrolyte powder) before the examination to promote the discharge of intestinal contents, so that the intestinal tract will be in a clean state, which is conducive to the doctor’s observation. Therefore, as a rule, if there is no contraindication to taking laxatives, it is necessary to take laxatives before the examination in order to prepare the bowel. However, if the patient suspects or suffers from intestinal obstruction and other diseases that are contraindications to taking laxatives, and if taking laxatives may aggravate the original disease, then taking laxatives is generally not considered. However, for the accuracy of colonoscopy, the use of enema can be considered to clean the intestinal tract to facilitate observation by the doctor. Before doing colonoscopy, patients must strictly follow the doctor’s instructions for bowel preparation, so as not to affect the results of the examination.