The patient was admitted to the hospital with intermittent abdominal distension for more than 10 months, aggravated for 7 days, and congenital choledochal cyst with inflammation was considered by intensive abdominal CT. The patient had a large cyst and an upper gastrointestinal obstruction, which was indicated for surgery, but the scope of surgery was large and there were biliary-intestinal anastomosis and intestinal-intestinal anastomosis, and the technical requirements for laparoscopic surgery were high. After discussion in the department and active preoperative preparation, it was decided to perform laparoscopic choledochal cystectomy. Exploration: the gallbladder was about 10*5cm, the common bile duct and common hepatic duct were dilated, forming a cyst of about 12*10cm, compressing the duodenum, adhering to the duodenum, and the cyst was large in size. The cyst was first decompressed, incised in the anterior wall of the cyst, aspirated yellow bile, then the right wall, posterior wall, and left wall of the cyst were freed, then freed downward to the normal common bile duct, the common bile duct was broken, the distal end was closed, and the proximal end was elevated. Then the gallbladder artery was severed, the gallbladder was freed from the gallbladder bed, the left and right hepatic ducts converged into the common hepatic duct with normal bile duct texture, it was severed, the cyst and gallbladder were removed, then the jejunum was severed about 20 cm from the flexor ligament, the distal end was closed and lifted up in front of the colon, the end-lateral anastomosis between the common hepatic duct and the distal jejunum was performed, the anastomosis was open and the blood tension was satisfactory, then the subumbilical incision was extended and the cyst and gallbladder were put into the retrieval device and removed Then, the small intestine was raised from the incision, and the proximal jejunum was anastomosed with the distal jejunum at about 40 cm from the distal jejunum, and the anastomosis was smooth and the blood flow tension was satisfactory. The postoperative pathology showed that the histological images were consistent with congenital common bile duct cyst, and the patient was able to get out of bed early after surgery, and could eat and drink early, and recovered well. In comparison with the traditional surgical approach, the longest incision of laparoscopic surgery is only about 5 cm (to remove the specimen and to assist in intestinal anastomosis), which is less traumatic, with a shorter exposure time of the abdominal cavity, better peritoneal integrity, faster recovery, less pain, and shorter hospital stay. The surgery is less invasive, with shorter peritoneal exposure, better peritoneal integrity, faster recovery, less pain, shorter hospital stay, and fewer complications. Of course, the technical requirements of laparoscopic surgery are high, requiring the surgeon to be proficient not only in the techniques of open surgery, but also in good laparoscopic skills, but with the accumulation of experience and the continuous improvement of surgical techniques, this type of surgical approach will become the most desirable surgical approach for both the surgeon and the patient. Intraoperative exploration