Intracranial arachnoid cyst (IAC) is a benign non-tumor lesion that accounts for 0.4% to 1% of intracranial occupying lesions. The clinical manifestations of IAC vary depending on the location and size of the cyst. 4. recurrent seizures that cannot be controlled by drugs, and EEG confirms the presence of epileptic waves in the cystic region; 5. pediatric patients, who may be asymptomatic in the early stage, have positive significance for early surgery in order to reduce the compression of brain tissue and promote the development of adjacent brain tissue. There are many surgical methods for IAC, including simple cystectomy, cyst-abdominal shunt surgery, brain stereotactic surgery, and microsurgical resection aimed at establishing traffic with the subarachnoid space. During surgery, in addition to perfecting hemostasis, the following issues should be noted: 1. Keep the integrity of the cyst as much as possible and maintain certain tension to facilitate separation of the cyst; 2. Remove as much of the medial wall of the cyst as possible without damaging important structures, and loosen the arachnoid membrane over the large vessels under the inner layer of the cyst and the surrounding vessels; 3. Protect the important vessels around the cyst, especially the lateral fissure vein and the bridging vein, to reduce the 4.The cyst fluid must be released slowly during surgery to avoid subdural hematoma caused by collapse of brain tissue or displacement of midline structures; 5.The field should be repeatedly rinsed with saline until the fluid in the field is clear to prevent recurrence of cyst and aseptic meningitis due to adhesion; 6.If the cyst cannot be completely removed, electrocoagulation is not necessary if there is no bleeding in the residual cyst wall to prevent serious complications caused by vascular injury or spasm 7.For tension IAC and giant IAC, dural bone window suspension is routinely performed after cyst excision to avoid epidural hematoma.