Compared with normal aging， there are some characteristic changes in electroencephalography （EEG） of patients with Parkinson disease（ PD）. This paper reviews current clinical studies on the EEG changes of PD in comparison to normal aging， starting with early identification， motor symptoms， and non-motor symptoms. It is hoped that the clinical study of EEG in the field of PD can provide valuable information for understanding the pathophysiological mechanism of the disease and assisting diagnosis and treatment.