There is no exact number of how many times the colonoscopy is usually pulled clean, most of them are 6~8 times, and there are more than 10 times, which varies from person to person. Before the colonoscopy need to be instructed by the doctor to take intestinal cleansing drugs, such as compound polyethylene glycol electrolyte dispersal, lactulose, etc., during the period of time, but also drink a lot of water, to promote the discharge of stools, so as to play the role of intestinal cleansing, but this is not through the number of times the number of times the stool is calculated, mainly to the watery stools shall prevail, that is to say, the intestines are clean, and will not affect the vision of the time when doing the colonoscopy. However, usually after taking laxatives, the number of stools will be more, mostly 6~8 times, some may need more than ten times of stools to be completely cleared. You must be instructed by your doctor to take laxatives before the colonoscopy, and not to use them at your own discretion, and you should pay attention to observe the situation of the stool.