Peritoneal dialysis patients who also have contraindications to colonoscopy can not do colonoscopy, if there is no contraindication to colonoscopy generally can do colonoscopy. If the patient peritoneal dialysis at the same time have more serious anal or rectal stenosis, or the patient has not yet recovered perianal abscess and anal fissure, etc., generally can not do colonoscopy; for the combination of metastatic tumors in the abdominal cavity, the heavier high blood pressure peritoneal dialysis patients with ascites, as well as combined with the pregnancy peritoneal dialysis women patients, who can not be cooperated with the person also can not do colonoscopy. It is recommended that patients inform the doctor of their condition before the colonoscopy, and the doctor will judge whether the colonoscopy can be performed or not, and must not hide their condition to avoid adverse consequences.