1, colonoscopy, need to clean intestines, so at least after drinking laxatives, the number of stools greater than 5 times, the last stool into a watery, colorless best. 2, colonoscopy, the need to expose the anus, so it is best not to wear dresses, pantyhose, tight pants, wearing loose sportswear is good. 3, colonoscopy, more left-sided position, so do not put things in the pants pocket, belt, to avoid falling lost. 4, colonoscopy, the need to inflate the intestines, so the belt or trouser pockets to loose some. Beijing Hospital of Traditional Chinese Medicine, Department of Spleen and Gastroenterology, Du Zhengguang 5, during the colonoscopy, problems may be found, in order to confirm the diagnosis, the intestine may be biopsied, so think beforehand whether you have oral anticoagulants, whether you have diabetes, whether your body is prone to bleeding, whether you are anemic, whether you have high blood pressure, what medications you take orally, to prevent the examining doctor from asking you when you can’t remember for a while, all these are very important and should be informed to the examining doctor. 6, before the colonoscopy, you can communicate more with the doctor who applied for the examination, consult him which diseases to consider, some of which can be treated endoscopically, you should consider whether you can accept. 7.Before colonoscopy, inform yourself whether you have a history of surgery in the abdomen, which is helpful for the doctor to examine the intestine and analyze the lesions.