The authors tried a direct electrical stimulation therapy on the paralysed nerves under direct vision. Four cases were treated. Case 1. 26 years old female with fiacced paralysis of right arm with sensory deficit. The onset of the paralysis was sudden while she was taking bath without any noticable trauma. Although the exact cause of the parlysis was undetermined, it was thought to be due to some vascular disturbance in the brachial plexus. An exploration of the brachial plexus with partial resection of the clavicle were performed three years following the onset. At the time of the operation the right brachial plexus nerves were stimulated whith low frequency rectangular electrical current for five minuites It was observed that the paralysed muscles began to twitch and finally gained voluntary movements following this stimulation. The percutaneous electrical stimulation were repeated for two months after the operation. At the time of discharge she showed remarkable improvement of the paralysis. Case 2. 24 years old male with traumatic brachial plexus lesion. An exploration with neurolysis of the plexus war performed four months after the injury. The affected nerves were seemed to be fibrous and connected with scarred tissue. A direct electrical stimulation was performed immediatly after the neurolysis. The recovery of the motor and sensory paralysis was fair. Case. 3. 20 years old male with diagnosis of ischemic contracture in right forearm. The flexor muscles of the forearm were necrotic showing green gelatin like appearance. The medial and ulnar nerves seemed to be thin and cyanotic. Although the direct electrical stimulation was performed, no recovery was obtained. Case 4. 19 years old male with facial paralysis of five years duration. The direct electrical stimulalion gave no recovery. Though the percutaneous electrical stimulation has been the common physical treatment for the paralytic nerves, a direct electrical stimulation of the exposed nerve is thought to be more effective. Of the four cases above, the case 1 gained an excellent results, the case 2 fair, and the case 3 and 4 poor. It is reasonable that the degenerated nerve fibres do not recover, but some living but nonfunctioning nerve fibres might receive better results from the stronger activation by the direct electrical stimulation than by the ordinary percutaneous one.