Bowel cleansing is required before proctoscopy if there are no special emergencies and contraindications. 1. Commonly used bowel cleansing medications include polyethylene glycol electrolyte dispersions, sodium phosphate salts, and magnesium sulfate. These bowel cleansing medications need to be prepared with at least 2000ml of water and are usually taken within 3 hours. After the bowel movement has achieved the effect of clear water-like stools, anti-foaming agents such as dimethylsilicone oil loose or simethicone oil are taken to clear the air bubbles in the bowel in order to improve the quality of the bowel preparation. 2. Since the proctoscope is only used to enter the anus about 20cm from the anus, in order to save time you can give the patient a soap and water enema, as far as possible, the contents of the rectum after the excretion of clean, you can also carry out proctoscopy. The above drugs are prohibited for those who are allergic to them, and they should all be taken in accordance with medical advice. It is recommended to choose the appropriate type of bowel cleansing under the guidance of a doctor in order to detect the disease in time and carry out targeted treatment.