Bladder dilatation is the opening of the abdominal cavity after the interception of suitable bowel, anastomosis of the remaining bowel, anastomosis of part of the interception of the bowel and the healthy bladder, as follows: 1. Preoperative preparation: bowel preparation, prophylactic application of antibiotics, skin disinfection and preparation, choice of epidural block anesthesia, lying position, buttock elevation. 2. Intraoperative: open the abdominal cavity, choose the intestines used for enlarging the bladder such as sigmoid colon, cecum and part of the ascending colon and ileum section, cut the appropriate length, anastomose the remaining intestines, excise the unhealthy and diseased part of the wall of the curved and contracted bladder, anastomose the intercepted intestines and the remaining healthy bladder, and close the abdominal cavity. 3. Postoperative care: bladder irrigation should be carried out regularly after the operation, catheter should be removed to try to urinate after a period of postoperative recovery, ureteral stent tube should be removed, tracheal drain tube should be removed after the operation, and regular postoperative follow-up should be done. If there is any discomfort, timely consultation is recommended.