MRI examination is mainly used for soft tissue examination, and nerves belong to soft tissue. MRI is mainly used for the diagnosis of cerebral infarction, craniocerebral trauma, encephalitis, craniocerebral congenital developmental malformations, brain tumors and other diseases, but it is not good for acute attacks. In addition the examination of nerves can be tested by EEG, magnetoencephalography, evoked potentials, electromyography and nerve conduction velocity. Different tests are chosen for different situations, such as EEG is mainly used for classification of epilepsy, and EMG is mainly used for diagnosis of peripheral neuropathy, so it is necessary to make a judgment on the basis of the current situation in a specialized doctor, and then choose the most meaningful test.