Epilepsy is a chronic neurological disorder characterized by recurrent seizures, and seizures are the clinical manifestations caused by abnormal and hyper-synchronized neuronal discharges in the brain. The long-range video EEG can record the bioelectrical activity of the brain and the clinical manifestations of seizures at the same time, so the EEG is indispensable for the diagnosis and evaluation of epilepsy. EEG abnormalities are random in nature, and the longer the examination, the greater the chance of capturing epileptiform discharges. For patients with epilepsy, it is recommended that at least 4 hours of video EEG be examined as an outpatient and at least 24 hours of video EEG as an inpatient. VEEG has several major uses: 1) to determine the nature of seizure events; 2) to clarify the diagnosis of epilepsy or epilepsy syndrome; 3) to determine the type of seizure; 4) to determine the site of seizure origin; 5) to assess the patient’s suitability for surgical treatment; 6) to determine the prognosis of the epileptic patient; and 7) to assess the efficacy of antiepileptic drugs.