Patients who need to undergo colonoscopy are advised to wear sportswear with elasticated trouser bands to the hospital. The patient should avoid wearing dresses or long tops, because during the colonoscopy, the patient needs to be in a side-lying, knee-bending position to facilitate pathological observation of the intestinal tissues by the medical staff. If the patient is wearing a dress or a long top, the examination can be interfered with due to the sagging of the dress. In addition, the patient should maintain a fasting state for more than 8 hours before undergoing colonoscopy, and take moderate laxatives to promote the excretion of metabolic substances in the body, which not only can effectively reduce the occurrence of adverse symptoms during the examination, such as lower abdominal pain and fecal incontinence, but also has a positive impact on improving the accuracy and timeliness of the examination.