When preparing for colorectal surgery, the clinic can choose polyethylene glycol bulk, or sodium phosphate salt, etc.. 1. Polyethylene glycol powder: the bowel preparation for colorectal surgery can be carried out one day before the operation, and oral laxatives can be taken at night before the operation to clean up the intestinal tract, paying attention to the appropriate amount of fluid rehydration. Polyethylene glycol powder can be taken at around 7 o’clock in the night before the operation, pay attention to drink more water, more exercise to promote defecation, until the stool is yellow or colorless transparent stool. 2. Sodium Phosphate Salt: Sodium Phosphate Salt can be chosen and can be taken at about 7 o’clock on the night before the operation. It should be taken with warm boiled water and mixed well, pay attention to drink more warm boiled water until the stools are colorless or yellow transparent watery stools. For preoperative preparations related to colorectal surgery including the preparation of oral laxatives, you can consult a colorectal surgeon in your regular hospital. The medication should be applied under medical supervision.