对50例40岁以下成年男性不明原因长期尿频、排尿困难及耻骨会阴疼痛患者膀胱尿道测压发现:96％存在着功能性尿道梗阻,表现为后尿道压力和（或）长度升高,可为酚妥拉明逆转。有不稳定膀胱、逼尿肌无力和高顺应性膀胱者分别为48％、18％和8％。有否排尿困难与尿道梗阻程度及膀胱功能状况有关。尿流动力学检查有助于病因分析和指导临床治疗。 Bladder urethral pressure was measured in 50 patients under 40 years of age who had unexplained long-term urinary frequency, dysuria, and puborectalis pain: 96% had functional urethral obstruction, manifested as an increase in posterior urethral pressure and / or length, Phentolamine reversed. Patients with unstable bladder, detrusor weakness and highly compliant bladder were 48%, 18% and 8%, respectively. Whether dysuria and urethral obstruction and bladder function related to the status. Urodynamic studies help to analyze etiology and guide clinical treatment.