Objective To summarise the methods for a long segmental avulsed inj ury of ureter.Methods Ureteroscopies were performed on three male patients with upper ureteral calculi and one female patient with haematuria from upper urinary tract.Ureteral calculi caused small and middle hy-dronephrosis,obstruction wasn't seen on the upper urinary tract with haematuria.The kidney on the affected side showed normal founction on IVP.Four patients were suffered from a long segmental avulsed inj uries of full-thickness of ureter from ureteroscopy in a continuous epidural anesthesia.The injuries took place in UPJ and upper ureter.The length of avutsed ureters is 20-25 cm,mean length is 24 cm. Results The ureteroscopies were altered to open operations which were ileal ureteral substi-tutions on two patients,being anastomosed the avulsed ureter wrapped by caul on one patient and nc-phrectomy on one patient under general anesthesia in an emergercy.Two ileal ureteral substitutions had reached satisfied results that were no damaged renal functions,no metabolic acidosis,no repeatly U-rinary tract infections and no complains about micturition.One patient has maintained normal renal morphology and function after thirteen years followup,the other formed stricture in the anastomosis of the proximal piece of-ileum to the renal pelvis tWO years after operation,and then improved after ante-grade dilation.The patient with being replaced back and anastomosed the avulsed ureter had compli-cated with a renal atrophy on the affected side three months after the double-J was extracted.The kid-ney showed no function on isotop nephrogram and then was ablated.The last one with nephrectomy and the one before were followed up regularly,the renal functions and blood pressures remain normal.Conclusion Ileal ureteral substitution would be a good choice and has a stable curative effect and provide a good prognosis for treating long segmental avulsed injury of ureter suffered from ureterosco PY when no available urinary tract was utilized for reconstruction.