1.If urine leakage or large amount of drainage fluid or peritoneal irritation sign occurs after surgery, urine, blood and electrolyte and creatinine and urea levels in ascites or drainage fluid should be checked immediately. When the creatinine and urea levels in ascites or drainage fluid are higher than in blood and close to the levels in urine, the diagnosis of urinary fistula can be made. 2. Cystoscopy or bladder methylene blue test helps to diagnose bladder fistula. If negative, intravenous or cystoscopic retrograde pyelogram is performed to find out the presence of hydronephrosis, ureteral obstruction, and ureteral fistula. 3. Under the premise of protecting renal function, patients with postoperative urinary fistula are first treated conservatively. Ureteral fistula is placed under cystoscopy with ureteral double J tube, and the bladder fistula keeps the ureter continuously open and can usually heal by itself. 4, when conservative treatment is ineffective, surgical treatment is required. After surgery, strengthen management, prevent infection, and keep the drainage continuously open. Clamping the ureter is not recommended to prevent the anastomosis from leaking again when the tension increases. Pay attention to the self-perceived symptoms after removal of the urinary catheter and measure the residual urine if necessary. The ureteral double J tube is usually removed 2 to 3 months after surgery.