Stereotactic EEG SEEG is a new technique for localizing epileptic lesions that has emerged internationally in recent years. This technique introduces the localization method from 2D to 3D level, providing all-round three-dimensional coverage of the brain, thus reaching the goal of accurate localization of lesions and improving the treatment effect. Stereotactic electrodes can be placed directly to any target site in the skull, such as deep frontal lobe, medial cerebral side, cingulate gyrus, medial temporal lobe and other areas that cannot be reached by conventional cortical electrodes, and the path of electrodes can be set before surgery, thus avoiding intracranial arteries and veins and greatly reducing the risk of surgery. The main advantages of stereotactic electrodes are: 1. Precise positioning: each patient has an individualized surgical path, and each contact of the electrode corresponds to a different anatomical site; 2. Small surgical trauma: only a small 3mm hole can be drilled in the skull under local anesthesia, and the patient can walk on the ground on the same day after surgery. In contrast, conventional subdural cortex requires craniotomy with a large bone flap under general anesthesia; 3. Wide monitoring range: it can monitor bilateral and multiple brain lobes, which can help the differential diagnosis of scattered brain areas; 4. Comprehensive functions: in addition to detecting epileptic foci, it can also perform cortical function localization and evoked tests; 5. Thermal coagulation destruction function: for small lesions, the thermal coagulation function of electrodes can be used to destroy them, avoiding craniotomy Surgery.