The human brain has strict functional partitions, and epilepsy caused by lesions in different parts of the brain has correspondingly different EEG and seizure movements. Therefore, when doing routine scalp EEG, it is important to clearly record the patient’s EEG during the seizure and interictal periods, but it is also important to clearly record and repeatedly play back the evolution of the patient’s seizure symptoms to determine the order and degree of involvement of each brain functional area in the seizure, which is crucial to finally locate the location and extent of the epileptogenic focus. In recent years, in specialized epilepsy centers, emphasis has been placed on the use of video EEG technology, i.e., combining EEG tracing technology and videotaping technology, video recording while doing EEG, and standing up the EEG and video images of each moment one by one through software, allowing the simultaneous video recording of the patient’s seizures to be viewed while studying the EEG, greatly improving the understanding of seizure events and It is relatively easy to shave off the interference of artifacts and exclude non-epileptic seizure events. According to the number of sampling electrodes of EEG, it can be divided into 16-lead, 32-lead or 64-lead video EEG. When buried intracranial electrodes are used for cortical EEG video monitoring, 128-lead or 192-lead video EEG is generally selected, and the number of sampling electrodes can also be flexibly selected according to actual needs. According to the number of cameras, it can also be divided into single-camera and dual-camera video EEG. The disadvantage of single-camera video EEG is that it can only look at the general seizure or the partial seizure, which cannot be taken into account at the same time. Our epilepsy center always uses dual-camera video EEG, one captures the patient’s whole body to observe the overall seizure, and the other captures a partial one to better observe the subtle movements of the face and eyes during a seizure, such as smacking the lips, blinking, and the direction of eye deflection. This allows for a more comprehensive and objective recording of the seizure process and analysis of the relationship between clinical and EEG. During the preoperative evaluation, patients are usually allowed to receive long-duration video EEG monitoring under regular antiepileptic drugs, and the usual natural seizures are recorded as much as possible. In patients with fewer seizures, the dosage can be reduced appropriately if necessary, but it is not advisable to adopt an evoked approach, so that the non-usual seizures recorded sometimes tend to interfere with the judgment of the real epileptogenic focus instead.