Objective:To explore the clinical pathogenisis of urination dysfunction in aged males and evaluate the bladder and urethra function by urodynamics studies.Methods:Clinical etiological diagnosis and urodynamic studies were performed in 304 aged male patients with urination dysfunction.Results:Among the entire 304 patients

186(61%)patients had benign prostatic hyperplasia.21(7%) patients had other male genitourinary system diseases.77(25%)patients had no male genitourinary system diseases.Urodynamic studies diagnosed:132(43%)patients had bladder outlet obstruction;119(39%)patients had detrusor instability;187(61%)patients had detrusor muscle with poor compliance;77(25%)patients had detrusor muscle weakness;38(12%)patients had detrusor-external sphincter dyssynergia.Conclusion:Multisystem and multi-species diseases can cause urination dysfunction in aged males.Urodynamic studies is efficacious for the cognition of the bladder and urethra dysfunction.Clinical etiological diagnosis combined with urodynamic studies can make the diagnosis of urination dysfunction in aged males more precise.