A statistical analysis was made on 124 cases of urinary calculi during the period from Jan. 1968 to Aug. 1971 on the Department of Urology of Capital Military Hospital, and the results were obtained as following; 1. The incidence of urinary: calculi was 2.04% of out-patients. 2. The age of the patients ranged from 20 to 30 years in approximately 75.8%. 3. A seasonal occurrence was a most high during summer on 41.6%. 4. The locational distribution of urinary calculi was 59.7% in ureter, 28. 2% in kidney, 8. 1% in bladder, 4. 0% in urethra. Approximately 9. 1% of the upper urinary calculi was found bilaterally. 5. The most favored predirection of ureteral stone was lower one-third in 70.2% of all cases. 6. In a number of urinary calculi, 83.9% was single and 16.1% was more than 2. 7. The ureterolithotomy was performed on 40 of 80 cases requiring surgical intervention. Cystoscopic manipulation and conservative treatment were 13. 1% in the each. 8. The results of qualitative analysis of 73 urinary calculi showed calcium phosphate + oxalate in 49.3%, calcium phosphate in 16.4%, calcium oxalate in 15.1%, calcium carbonate in 8.2%, calcium phosphate + uric acid in 4.1%, calcium oxalate + urate in 4.1%, calcium phosphate
+ammonium in 2.8%
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