Brainstem evoked potential examination is mainly used to objectively evaluate the hearing of patients who cannot cooperate with the hearing examination. It can also indicate the disease in advance when tumors in the pontocerebellar and cerebellar areas do not show obvious changes on cranial CT, and can also detect the manifestation of multiple sclerosis at an early stage, and can also help determine brain death, etc. This test can be used for surgical monitoring during surgery of some pontocerebellar horn tumors to avoid surgical damage to the auditory nerve. Brainstem evoked potentials are mainly used to stimulate the auditory nerve conduction pathway through the sound coming from the headphones, and some specific points are recorded on the overhead recorder, etc.