We reviewed the detail clinical history and results of vestilbular function test in 288 cases of acute dizzy patients who visited the Department of Otolaryngology, Kangnam General Hospital during a period of March, 1991 through February, 1994. The following results were obtained. 1) The most common disease of peripheral vestibular system was benign paroxysmal positional vertigo and the second most one was acute toxic labyrinthitis. In central nervous system, cerebrovascular accident was the most common cause. 2) The most common complaint was rotation sense lasting several minutes. 3) The one-third of patients had experience of previous vertigo attack and half of them had frequent attacks. 4) The cochlear symptoms such as tinnitus, hearing loss and ear fullness were usual in peripheral vertigo. Headache was more common in central vertigo. 5) The usual underlying diseases related with vertigo were hypertension and diabetes mellitus. 6) Positive results of vestibular function test in dizzy patients as a whole were as follows ; (1) Spontaneous nystagmus : 15.9% (2) Gaze nystagmus : 20.2% (3) Head-shaking nystagmus : 29.9% (4) Romberg test : 26.8% (5) Positional nystagmus : 25.3% (6) Positioning Nystagmus : 32.4% (7) Caloric test : 16.3%. 7) In cases with the suspicious central disorders, CT and MRI had great diagnostic significance. 8) Disappearance of gaze nystagmus with antivertiginous therapy was within 7 days in almost all cases.