During the period of 4 years from July , 1976 to June, 1980 the raiological and clinical evaluation had been made on 102 patients suffered from lower urinary tract injuries which were confirmed by the radioloigcal examination and operation. The results were as follows : 1. Age distribution of the total 102 patients (87 males and 15 females) was broad form 4 to 72 years. And most of the patient were in the age group of 20 to 49 years. 2. The most common cause of injury was traffic accident (67.6%) nest blunt trauma, saddle injury, fall down respectively. 3. 46 patients of bladder injury were as follows : intraperitoneal rupture in 17, extraperitoneal rupture in 12, and contusion in 14. 4. 74 patients of urethral injury were as follows : membranous portion in 37 , bulbous portion in 31, prostatic portion in 3, and penile portion in 2. Most of the cases showed extravasation of contrast media. 12 cases showed extravasation with venous intravasation. 5. contusion or extraperitoneal rupture of the bladder, membranous urethral injury, and concommitent bladder and urethral ruptures were frequently assocciated with pelvic bone fracture, Intraperitoneal ruptures of the bladder and solitary ruptures of the bulbous urethra were infrequently associated with pelvic bone fracture. 6. Late seqeulae of the lower urinary tract injury tract injury were stricture, fistula and stone formation.