Colonoscopy precautions include: 1, intestinal preparation is a very important part of colonoscopy. Patients are required to consume a slag-free, low slag diet 24 hours before the examination and take oral laxatives to clear the intestine, and laxatives are better tolerated when taken in divided doses according to the dose; 2. Patients cooperate with the doctor to do the examination to facilitate the passage of the colonoscope through the intestinal bend; 3. Do not eat too early after the examination when the abdominal cavity is distended and intestinal function has not recovered, and if there are biopsies and endoscopic polypectomies, the diet will be restored even later; 4. The painless colonoscopy is over. Patients are asked to go home accompanied by their family members after they are awake.