The author has studied 726 cases of cancer of the uterine cervix, as to the influence of pelvic drainage on dysuria and urinary fistulation after the Okabayashi's radical hysterectomy. Beginning of spontaneous void was 15.5 days after operation on an average. Among cases in which spontaneous void occurred within 2 weeks, there was no marked difference according to cases of non-drained, drained paracoccygeally and drained coccygeally. The occurence of retroperitoneal infection was considerably low in the drained cases and in the cases of non-drained. but with open vaginal stump, comparing to the cases in which the vaginal stump was closed primarily. But postoperative urinary infections occured frequently equally in both of drained and non-drained cases. The rate of dysuria became higher in groups complicating retroperitoneal or the urinary infections. When there were no postoperative complications, the rate of dysuria was equal in both drained and non-drained cases. The postoperative urinary fistulation was in 29 cases (4.0%) out of 719; 8 cases (3.5%) out of 228 cases of paracoccygeal drainage, 21 cases (4.3%) out of 488 cases non-drained: there were no remarkable differences in this sampling. The urinary fistulation was highly influenced by injury during operation and postoperativ retroperitoneal infection.