There were 22 patients with brain tumor initially impressed by electronystagmography and then proved by magnetic reso nance imaging in the past 5 years. After analyses of the electronystagmograms and clinical manifestations, we conclude that if the patient has several abnormal central signs, such as gaze nystagmus、rebound nystagmus、opsoclonus、no caloric response、failure of fixation suppression、augmentation of caloric nystagmus in light, and clinically concomitant with hearing loss, persistent dizziness, ataxia, and vomiting, brain tumor should be taken into consideration.