Facial myoclonus is a hemifacial muscle twitch, a dysfunctional syndrome resulting from irritation of one side of the facial nerve. Patients are mostly adults over 40 years of age. It may be associated with arteriosclerosis and hypertension. The disease is poorly treated with medication and is only effective in some mild cases, and is prone to recurrence. Research over the past 20 years has shown that facial spasm is caused by compression of the facial nerve at the exit of the pontine brain by abnormal blood vessels. The purpose of microvascular decompression is to relieve the compression of the facial nerve by the abnormal blood vessels to eliminate the facial muscle twitching. Microvascular decompression is a minimally invasive locked-hole surgery with a small incision in the hairline, which is less invasive, safe and efficient, and is currently the best choice for the radical treatment of facial muscle spasm.