Operations on inpatients during the 15-year period from 1975 to 1989 were analyzed statistically. A total of 3,791 operations were performed at our Department of Urology, including 717 operations on the kidney, 316 operations on the ureter, 583 operations on the bladder, 811 operations on the prostate, 136 operations on the urethra, 1,097 operations on the scrotum, 43 operations on the adrenal gland, 19 operations on the retroperitoneal space and 69 operations on other organs.