1, before the examination 1, two days before the examination, into less slag diet, do not drink milk, do not eat watermelon, tomatoes and other foods that may affect the examination. On the day of the examination, you can have a small amount of liquid food for breakfast and abstain from eating vegetables and fruits. 2, constipated patients, two days before the examination can take laxatives. 3, the morning of the examination need to take oral medication (such as antihypertensive drugs), suffering from serious cardiopulmonary disease, blood clotting mechanism disorders, hypertension, severe intestinal adhesions, intestinal obstruction, female menstruation and recently taking aspirin drugs, please communicate with the doctor in advance to discuss. 4. Take a laxative in the morning of the examination to cleanse the intestines as prescribed by the doctor. 5. For painless colonoscopy, you must be accompanied by family members. Please bring all medical records and previous examination reports before the examination. During the examination 1. The patient enters the examination room and lies on the examination bed with the left side facing down. 2. The general examination takes about 10~15 minutes. Please relax and cooperate with the doctor. Light music can be played for you to distract you and reduce your tension. 3. Patients who are afraid of colonoscopy can choose painless colonoscopy. First, the nurse will infuse fluids, and then the anesthesiologist will administer intravenous anesthesia. Patients are examined during anesthesia sleep, without any pain, safe and comfortable. 4. During the examination, the physician will decide whether to conduct biopsy pathology examination according to the condition, and will not inform the patient and family members separately. After the examination, 1. appropriate walking can help to eliminate intestinal pneumonia and reduce abdominal discomfort. 2. For those who take biopsy, alcohol and stimulating food are prohibited, and a semi-liquid diet is allowed for one day. Resume normal diet the next day. 3. No bicycle or motor vehicle, mechanical operation, overhead work, actuarial and logical analysis, etc. are allowed on the day after painless colonoscopy. 4. For those who do not take biopsy, you can take the examination report sheet after the examination; for those who take biopsy, you need to come to our department to take the examination report sheet and pathology report sheet according to the time informed by the pathology department.