Abstract: The results of Somatosensory Evoked Potentials （SEPs） and Visusl Evoked Potentials （VEPs） were analyzed in 173 head injury patients, with 182 of SEPs, 157 VEPs in healthy subjects as controls examined separately. Both groups were compared with the routine EEG recording, which was based upon the results with normal or only with mild abnormal signs in neurological examination.The abnormal SEPs were shown by the prolongation or disappearance of peak latency or attenuation in amplitude of early component of contralateral cortical waves after median nerve stimulation. Abnormal VEPs were characterized by any component of N₁-P₁-N₂ triphasic waves sho- wing disappearance of peak latency delay or asymmetry amplitude after flash stimulation to left or right eye seperately.The abnormality of all these three modalities was much less marked as clinical course prolonged; but the SEPs abnormality was more marked than that of EEG and VEPs either in the early or the late stage of head injury.We suggest that the SEP might be the most objective and sensitive physiological parameter for measuring cerebral function in head injury patients.