Hemifacial spasm is a distressing condition characterized by involuntary, intermittent, unilateral twiching of part or all of the muscles innervated by the facial nerve. Vascular compression of the root entry zone(REZ) of the facial nerve is the main cause of hemifacial spasm. Mobilizing the offending vessel will cure or significantly improve the symptom of the patient. We present the result of microvascular decompression of the facial nerve at REZ of eight patients with hemifacial spasm. Six patient were cured from hemifacial spasm. One patient improved. One patient did not improve. Complications are discussed.