Study on brainstem mechanism of different electroacupuncture intensity in treatment of peripheral facial paralysis

INTERVENTION: 1:Sensory threshold stimulation group;3:Sham EA stimulation group;2:Motor threshold stimulation group; CONDITION: peripheral facial paralysis PRIMARY OUTCOME: Electromyography of facial nerve;blink reflex;House‐Brackmann score;facial disability index scale; INCLUSION CRITERIA: ? Meeting the diagnostic standards, staging standards and positioning standards of traditional Chinese and western medicine for peripheral facial paralysis; ? Right‐handed, aged from 18 to 65; ? Facial paralysis is unilateral and the course of disease is at least three months; ? Signed informed consent and volunteered to participate in this study.