1. Preoperative care: keep the airway unobstructed, establish intravenous access, give antibiotic treatment, prevent postoperative infection, etc. Pre-operative fasting, gastrointestinal decompression, surgical field preparation according to surgical routine, and atropine injection according to general anesthesia routine. 2.Postoperative care: keep the gastrointestinal decompression unobstructed after surgery, generally remove the gastrointestinal decompression tube 2 days after surgery, first give drinking water, if there is no abnormality in drinking water, you can eat liquid food or milk. Three days after surgery, the abdominal condition of the child should be closely monitored because the application of anesthetic drugs and postoperative pain pump will inhibit the recovery of intestinal function, and eating too early or too much will cause abdominal distension, even vomiting and other symptoms. Therefore, a small amount of food should be eaten at the beginning of the postoperative period, and the amount of food should be gradually increased until 5 days after surgery, when the child can basically eat normally. Postoperative wound care is an important aspect of postoperative recovery. In general, the wounds of laparoscopic surgery, because of the small damage, the occurrence of postoperative infection is rare and the healing is better. The medication is changed 3 days after surgery and every 3 days thereafter until the laparoscopic wound is basically healed at the time of discharge. In case of open surgery, the medication change and healing time should be longer, usually 7-14 days, to avoid postoperative wound infection, the wound should be checked diligently, and if the wound shows signs of infection, the wound excipients should be removed and the wound can be healed by giving antiseptic water such as Andover to wipe the wound frequently. In children with common bile duct cyst, abdominal drains are usually placed intraoperatively, and can be removed if the daily drainage is less than 20 ml, and the abdominal drains should be kept fixed and unobstructed after surgery. After discharge, the child should keep the stool unobstructed to avoid cholangitis. Constipation can easily lead to the proliferation of intestinal bacteria, such as intestinal bacteria through the jejunohepatic branch upstream infection of the bile duct can lead to cholangitis.