EEG is divided into two types, static and dynamic, and is operated by a doctor attaching a special sensor of electrode pads to the patient’s head, and a computer records the electrical activity of the patient’s brain on a screen or in the form of a wave-like curve on paper. The principle is that through the EEG tracer, the brain’s own weak bioelectricity is amplified and recorded as a kind of curve graph to help diagnose diseases as a modern auxiliary examination method, which is not traumatic to the person being examined and has a certain diagnostic value for brain diseases. EEG is mainly used for the examination of intracranial occupying lesions, epilepsy and intracranial inflammation, including: 1. Epilepsy: EEG has the greatest diagnostic value for epilepsy and can help determine the diagnosis and clinical typing, judge the prognosis and analyze the efficacy; 2. Cranial injury: such as concussion, minor injuries that are difficult to determine by ordinary examination may be found abnormal after EEG; 3. Intracranial occupying lesions: including benign and malignant tumors, which have certain auxiliary effect on their diagnosis; 4, central nervous system infections: such as various meningitis, encephalitis, cerebral parasitosis, etc.; 5, other: such as carbon monoxide poisoning, alcoholism, hepatic encephalopathy, congenital dementia, cerebral palsy, etc.