Facial myoclonus, also known as facial twitching and hemifacial spasm, manifests as episodic, rhythmic involuntary twitching of one side of the facial muscles. The incidence of the disease is 1 per 100,000, mostly seen in middle-aged and elderly people, and the cause of the disease is still unknown. It is generally believed to be related to the compression of the facial nerve from the brainstem by the abnormal alignment of the vertebrobasilar system. The facial nerve is stimulated by vascular pulsation, which produces abnormal nerve impulses and leads to facial muscle twitching. Facial muscle spasms mostly start from the lower eyelid on one side and gradually spread to the face and even the neck muscles, and the spasms are intermittent at the beginning and gradually become more frequent, especially when emotional tension and fatigue are present. When the twitching is severe, it can cause facial pain and affect vision, speech and sleep. Treatment of facial muscle spasm is divided into conservative treatment and surgical treatment, the former includes oral medication and drug injection facial nerve block treatment, there is no special oral medication, clinical use of some sedative and tranquilizing drugs; nerve block treatment is the use of botulinum toxin, ethanol drugs to block the conduction function of the facial nerve, so that the facial muscle spasm is lifted. After injection, the nerve conduction is impaired and the facial muscle is immediately paralyzed or incompletely paralyzed, and such facial muscle paralysis can be recovered within a few months. The effect is short-lived, and most patients relapse in about 3-6 months and need to be treated by injection again. Common complications include facial palsy, dry eyes, diplopia, and dysphagia. Microvascula decompression (MVD) is currently the main method of treatment for facial spasm. Under the microscope, the blood vessels located at the root of the facial nerve which are abnormal and causing compression to the facial nerve are nudged away, thus relieving the compression of the facial nerve root, restoring the normal function of the facial nerve, and relieving the symptoms of facial muscle twitching. This technique has the advantages of minimally invasive, high safety, and low recurrence rate, especially it can completely preserve the function of blood vessels and nerves, which has become the most effective treatment for facial muscle spasm in the world. In addition, microvascular decompression is also used to treat trigeminal neuralgia, glossopharyngeal neuralgia, as well as intractable vertigo, tinnitus, neurogenic hypertension, spastic diastasis, and other diseases.