Objectives To evaluate the clinical usage of Renal Sheath Dilator in treating distal ureteral stones.Methods 17 patients with incarcerated ureteral calculi were selected.Zebra guidewire was placed with ureteroscope and renal sheath dilator was inserted serially to dilate the stricture under ureteroscope monitor.Ureteral calculi were managed with pneumatic ballistic or holmium laser through the ureteroscope or supplemented with Peelaway.KUB was veexamined to get the known of the efficacy of the stone clearance and the position of the double Jstent after the operation.Results 16 patients had completely success with one stage operation.One case of diabetes patient with upper urinary tract empyema due to stones obstruction was indwellt double J-stent at first,and after anti-infection treatment,a second procedure was performed.The result was successful.Conclusions The renal sheath dilator used in treatment of incarcerated women lower ureteral calculi,especially for the ureteral wall segments or distal ureteral calculi with narrow and difficult cases into the mirror,can reduce surgical trauma,save time and greatly improve stone clearance rate and reduce the rate of change to open surgery.It is a safe,effective and worthy method for promoting.