Relevant examination of the nervous system: imaging examination includes CT, MRI and other common examinations; examination of blood vessels includes MRA, cranial CTA, MRV and other examinations; the gold standard of vascular examination is cerebral angiography. Neurologic electrophysiologic examination includes electromyography, which can help diagnose central nerve, peripheral nerve and muscle lesions. Indications include: spinal cord lesions, peripheral neuropathies, abnormalities at the neuromuscular junction, and muscle tissue disorders. Visual evoked potentials: mainly used for visual disturbances, those with sudden loss of vision, optic neuritis, multiple sclerosis and compressive lesions of the anterior visual pathway. p100 wave latency is most valuable. Brainstem auditory evoked potentials: can determine the site of the lesion and initially determine the nature of the lesion. Includes determination of neurologic deafness, hearing impairment, early diagnosis of multiple sclerosis and acoustic neuroma. It can also evaluate the treatment effect of comatose patients. Somatosensory evoked potentials: it can determine whether there are lesions of peripheral nerves, spinal cord, brainstem and brain, and it is also one of the bases for the judgment standard of brain death. Clinical significance of electroencephalogram: identify organic and functional brain diseases: such as convulsions, mental disorders, deafness, blindness, etc. are organic or functional diseases. Auxiliary diagnosis, differential diagnosis and localization of various brain diseases; commonly used in patients with epilepsy, brain tumor, traumatic brain injury, intracranial hematoma, encephalitis, cerebral parasitosis, cerebrovascular disease and other brain diseases and coma. To find out whether the brain is involved in those who are suspected to have brain damage from systemic diseases. Follow-up to understand the changes of brain diseases, efficacy, and brain development. Transcranial Doppler and carotid artery ultrasound: it can be used to screen for intracranial macrovascular lesions; it can be used to understand the detection of microemboli in cerebral blood flow; and it can be used to screen for adventitious lesions in the carotid arteries.