1, pay attention to the temperature of the liquid, the temperature is too high will damage the colon and rectal mucosa. Too low a temperature will cause abdominal pain and bowel movements. 2, pay attention to the total amount of liquid, not more than 200ml. 3, anal tube and enema to keep clean and hygienic, disposable items should be replaced in a timely manner, non-disposable items should be disinfected by boiling regularly. 4, the front of the anal tube should be coated with a little lubricant, such as liquid paraffin, medical petroleum jelly or Ma Yinglong hemorrhoid cream, etc., the speed of insertion of the anal tube should be slow to avoid damage to the rectal mucosa. 5, pregnant patients should be used with caution, menstruation do not enema during menstruation. Those with more serious perianal diseases should not use Chinese herbal enemas for the time being.