Brain wave discharges are usually examined by EEG. EEG is currently the most important screening tool in the diagnosis and treatment of epilepsy. Despite the continuous development of high-resolution anatomical and functional imaging, EEG has always been irreplaceable to other testing methods in the diagnosis and treatment of epilepsy. When the brain is active, it generates an electrical brain wave that can be monitored and displayed by an EEG. This brain wave, under normal conditions, appears as a normal rhythm. When there are lesions in the brain, such as cerebral infarction, cerebral hemorrhage, brain tumor or metabolic brain disease, the brain waves in the corresponding area will be abnormal, which can be recorded and analyzed with the help of EEG to determine the nature of the disease, discover the lesion site, and compare it after treatment to determine the effect of treatment. Abnormal EEG discharge is a very broad concept, which can be abnormal changes of spike, sharp wave, spike-slow wave, sharp-slow wave, multi-spike wave and other epileptiform discharges; or non-specific abnormalities such as increased slow waves, diffuse slow waves and focal slow waves in the awake EEG. In particular, the latter abnormal presentation is often nonspecific and can be seen in cerebrovascular disease. Brain tumors, cerebral hypoxia, brain infections, and many other diseases. Therefore, abnormal brain wave discharges are commonly used in epilepsy screening, but are not limited to epilepsy, but can also be seen in the presence of other brain disorders.