Radiolographic studies of the temporal bone following head trauma are indicated when there is cerebrospinal fluid otorrhea or rhinorrhea , hearing loss, or facial nerve paralysis. Plain radiolgrpahy displays only 17-30% of temporal bone fractures and pluridirectional tomography is both difficult to perform, particularly in the acutely ill patient, and less satisfactory for the demonstration of fine fractures. Consequently, high resolution CT is the imaging method of choice for the investigation of sustpected temporal bone trauma and allows spacial resolution of fine bony detail comparable to that attainable by conventional tomography. Eight cases of temporal bone trauma examind at Koryo General Hospital April 1985 through May 1986. The results were as follows : Seven patients(87%) suffered longitudinal fratures. In 6 patients who had purely conductive hearing loss, CT revealed various ossicular chain abnormality. In one patient who had neurosensory hearing loss, CT demonstrate intract ossicles with a fracture nearing lateral wall of the lateral semicircular canal. In one patient who had mixed hearing loss, CT showed complex fracture.