Facial myoclonus, also known as facial twitching or lateral myoclonus, is a dysfunctional syndrome resulting from irritation of the facial nerve on one side. Most of them are on one side, and there are few bilateral cases, accounting for about 4%. It starts with eyelid twitching on one side, and gradually extends from the top down to half of the lateral muscles, and only in severe cases can it involve the neck and shoulder muscles. This involuntary spasm cannot be controlled by oneself and can be triggered or aggravated by emotional stress or overexertion. The muscle strength gradually decreases after a long period of illness, and in the advanced stage, it can develop to hemifacial paralysis and end. EEG and electromyography should be routinely performed, and if necessary, mammography and cranial X-ray, cranial CT and MRI should be performed to exclude mammographic and cranial disorders. Intracranial microvascular decompression was advocated by Jannetta in 1966, and is now a common method in international neurosurgery. Postoperative complications: 1. Intracranial hemorrhage and cerebral edema after surgery, leading to death in severe cases. 2.Injury to the superior cerebellar artery, anterior inferior cerebellar artery, posterior inferior cerebellar artery or basilar artery, leading to brainstem infarction. 3, posterior group cranial nerve injury caused by hoarseness drinking and coughing and swallowing difficulties 4, facial palsy hearing loss. 5, cerebrospinal fluid leakage, infection.