Pulling yellow water is not recommended to do colonoscopy, need to do further bowel preparation. Generally, when we carry out gastroenteroscopy, we have to take laxatives in advance to do a good job of gastrointestinal tract cleansing preparations, you can do the colonoscopy standard to achieve a watery stool, no fecal sludge inside, in order to follow up the gastrointestinal endoscopy doctor to observe the lesions in the intestinal tract, the field of vision is clear, accurate positioning. If you have yellow water before the bowel preparation, you need to under the guidance of the doctor for bowel cleansing preparation, at the same time to pay attention to water electrolyte disorders, acid-base balance, as well as to prevent the occurrence of hypoglycemia. If you continue to have yellow water with other uncomfortable symptoms, please seek medical attention to avoid delay.