Primary prosopalgian and prosopospasm are common clinical problems considered obstinate diseases without effective therapy in the past.Since June 1990,microvascular decompression of nervous reduces in pontocerebellar corner by posterior pathway of sigmodeus sinus has been performed on 141 patients with porsopalgian 117 cases and prosopospasm 24 cases.All patients were cured with the operation only once,which were no recurrence followed up from 6 months to 4 years and 6 months.This report elaborates the method and precaution of the operation,it also discusses the causes.