The authors evaluate the results of 315 ureteroscopies performed in 1991-1995 at the Urological Clinic in Brno Bohunice. 290 ureteroscopies were made on account of ureterolithiasis, diagnostic ureteroscopy was performed in 17 patients, in four instances extraction of a foreign body was involved and in four instances during ureteroscopy the stenosis of the ureter was severed. One-stage operations were successful in 226 patients (78%), in 42 patients (14%) after ureteroscopy ESWL had to be made. Ureteroscopy as a two-stage operation was performed in 12 patients (6%), five cases were resolved by open surgery because ureteroscopy failed. The authors evaluate early and late complications, none of which called for nephrectomy. The authors discuss the position of ureteroscopy in ureterolithiasis which is one of the most frequent indications.