Intravenous pyelograms of 106 cases of urolithiasis were anlyzed and concluded that : 1. The incidence is highest in age of 21 to year and male to female ratio is 1.8 : 1. 2. The predilection site is the lower one thirds of the ureter. 3. Advanced hydronephrosis is combined in 24 per cent of cases, respectively. 4. On scout film, the radiopaque stone account for 96 percent of all stones, respectively.