We compared several clinical parameters between two different prostatectomy procedures, transurethral prostatectomy (TUR-P, 26 cases) among aged cases of benign prostatic hypertrophy. All patients were over 80 years old and were treated at Nippon Medical School Hospital from January 1983 to December 1988. TUR-P was superior to open prostatectomy in the following aspects, (1) operation time, (2) total amount of transfused blood and (3) hospital stay.