If the stool is not clean before the colonoscopy, you can clean the enema as soon as possible, or you can suspend the colonoscopy at a later date, continue to take laxatives such as polyethylene glycol electrolyte powder, and at the same time, drink more water to promote the elimination of stools, in order to facilitate the accuracy of the colonoscopy examination. Enteroscopy is the most commonly used examination in gastroenterology, which can visually observe the lesions in the intestinal lumen, and for suspected neoplastic lesions, tissue biopsy can also be taken for pathological diagnosis. However, adequate preparation is needed before doing colonoscopy in order to make the examination smoother and see more clearly. The quality of colonoscopy is closely related to the preparation before colonoscopy. And the bowel preparation before colonoscopy is crucial. You should not eat after 7:00 p.m. the night before the examination, you can drink water and take bowel cleansing medication such as polyethylene glycol electrolyte bulk or mannitol, and the final bowel movement is watery before the bowel cleansing is considered successful. If the stool is not like water, it is recommended to continue to take bowel cleansing medication, and then drink more cold boiled water or cold sugar water, and if necessary, you can perform a cleansing enema to quickly remove the stool. If you can’t get rid of your bowel movement before the colonoscopy, it is recommended that you go to the hospital for a cleansing enema.