Before cervical conization, it is necessary to make clear surgical indications, exclude contraindications, prohibit sexual intercourse, make vaginal preparation, choose the timing, and prohibit diet. 1. Exclude contraindications: exclude acute or subacute inflammation of the reproductive tract, exclude blood diseases and other contraindications to bleeding tendency before surgery. 2. Prohibition of sexual intercourse: sexual intercourse should be prohibited 3 days before the operation to avoid causing postoperative infection. 3. Vaginal preparation: vaginal povidone-iodine douche should be given to reduce the amount of vaginal bacteria and can reduce the risk of postoperative infection. 4. Timing: The operation should be performed within 3~7 days after menstruation. 5. Dietary abstinence: Since the operation requires anesthesia, dietary abstinence is required for 6~8 hours before the operation to avoid serious complications such as choking, aspiration and suffocation during the operation. Cervical conization preoperative preparation needs professional physicians to give guidance, the patient should strictly follow the doctor’s instructions, in order to avoid causing adverse reactions.