Electroneuronography is the objective electrophysiologic measurement of muscle compound action potential used to assess the prognosis for recovery from facial paralysis. Electroneuronography is performed by delivering a percutaneous electric stimulus to the facial nerve trunk. The authors performed electroneuronography in 30 healthy adults who had not experienced facial paralysis and 15 patients who had experienced facial paralysis. The obtained results were as follows : 1) In the control group, mean compound action potential was 3.85mV on the right side, 3.62mV on the left side and there was no significant difference between them(p<0.05). 2) In the control group, the mean latency was 2.66 msec on the right side, 2.58 msec on the left side and there was no significant difference between them. 3) In the control group, the stimulating intensity showed no considerable difference between the right and the left side(There was no statistical significance). 4) In the control group, the test-retest variability was 18.74%. 5) In the patient group, diseased side showed reduced mean compound action potential compared to healthy side(p<0.01), the latencies and stimulating intensities showed no considerable difference. 6) There was no significant difference in the action potential between the control group and the healthy side of the patient group. 7) In cases where the compound action potential was less than 50%, all the cases showed complete recovery.