Facial myoclonus is a recurrent involuntary twitching of the facial expression muscles on one side of the face, 99% of which are primary, basically due to the presence of vascular compression in the cerebral region of the facial nerve. Facial myospasm tends to be insidious, slow and progressive in onset. In the early stages, the spasticity is often characterized by twitching of the orbicularis oculi muscle (mainly the lower eyelid), which gradually progresses to twitching of one side of the face, the corners of the mouth, and even the broad neck muscles are involved. Severe tonic spasms can lead to facial deformation, narrowing of the eye fissure and difficulty in opening, with symptoms such as tearing. The symptoms are aggravated by stress or fatigue, and a small number of patients continue to twitch at night during sleep. There is no tendency for the facial spasm to resolve automatically. Individual patients may have knee neuralgia, which is a severe ipsilateral auriculofacial pain, often without trigger points, caused by the involvement of the middle nerve of the sensory branch of the facial nerve. Although these clinical manifestations are not life-threatening, they often cause extreme facial discomfort, which not only affects cosmetic social interaction, but also causes difficulties in working, reading, walking, and driving a car due to frequent twitching. In some patients, abnormally shaped vessels can be seen at the roots of the facial nerve in the skull on CT or MRI scans, but no other abnormal findings. Currently, the main treatment for facial muscle spasm is microvascular decompression surgery, which is performed under a surgical microscope to push away the blood vessels located at the root of the facial nerve with abnormal alignment and causing compression to the facial nerve, and fix them so that they do not touch the facial nerve, 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 procedure is minimally invasive, safe, and effective as well as low recurrence rate and low complications, especially because it can completely preserve the blood vessels and nerve function, etc. Other methods include medication and botulinum toxin intramuscular injection, but all of them have problems such as incomplete treatment and easy recurrence.