Vocal hyperfunction is considered to be the most significant characteristic in larynx disorders which is found among many patients presenting hoarseness Primarily as chief complaint. In Pusan National University Hospital, we executed the voice therapy to 28 patients being 17 female and 11 male patients who visited the Voice ＆ Speech Therapy Clinic, due to the voice disorder, and then compared and analysed the voice before and after its therapy using acoustic and aerodynamic test. The obtained results were as follows. In the analysis by the local findings, it was improved to 88% in the patients of vocal nodule, 75% in mutational falsetto, 75% in the functional dysphonia, 75% in the vocal cord palsy, 50% in the vocal polyp and 50% in dysphonia plica ventricularis. For the acoustic analysis, Fo, litter, Shimmer and NHR were measured. In the patients of mutational falsetto, Fo, Jitter and NHR were shown to be improved significantly and in the patients of vocal nodule, Shimmer was shown to be improved significantly. In the patients of vocal polyp, Fo was significantly improved. In the patients of vocal cord palsy in litter and NHH were significantly improved. In the patients of dysphonia plica ventricularis, Shimmer and NHR were significantly improved and the patients of functional dysphonia were more improved in Fo, litter and Shimmer. For the aerodynamic analysis, MPT was measured. In particular, it was shown to be improved significantly in the patients of vocal nodule, improved in the vocal polyp, vocal cord palsy, functional dysphonia patients.