Brainstem Auditory Evoked Potential, is a very sensitive test used for brainstem injuries. The main principle of the brainstem auditory evoked potential test is to monitor the electrical activity on the auditory conduction pathways in the brainstem. Brainstem evoked potentials are primarily designed to detect normal brainstem function. Brainstem evoked potentials are not available for patients who are brain dead or who have suffered severe damage due to bleeding in the brainstem. Brainstem auditory evoked potentials are used to localize auditory nerve pathways and brainstem lesions. Brainstem auditory evoked potentials can not only indicate neurological damage, but can also localize the lesion site, and the results are relatively objective, especially for children. Therefore, brainstem auditory evoked potential examination is of great significance in the diagnosis and treatment of brain diseases.