A multitude of procedures such as cordectomy, arytenoidectomy and arytenoidopexy have been attempted to ameliorate the problems of bilateral vocal cord paralysis. These methods have partially improved airway symptoms in many patients, while others have been left with permanent tracheostomy and marginal airway due to incomplete resection or stenosis. For these reasons, investigators have continued to design operative procedures which might be more physiologic and less destructive. The purpose of this study is to know whether selective section or direct implant of adductor branch of recurrent nerve is possible or not as a treatment of bilateral vocal cord paralysis. To this purpose, laryngeal reinnervation procedures were performed in 10 adult mongrel dogs. Two dogs were used as control, four animals had selective section of adductor branch and the other four had implant procedure in which adductor nerve was routed to the posterior cricoarytenoid muscle. Three months after reinnervation procedures, telelaryngoscopy with television monitoring, videolaryngography and nerve stimulation test were used to obtain and evaluate data. Results of the study include the following ; 1) Telelaryngoscopy 3 months following reinnervation revealed no abduction during quiet and deep respiration in control group. Furthermore glottic chink was markedly decreased due to synkinetic medial bulging of the vocal cord. So neurorrhaphy at the trunk of recurrent nerve was ineffective as a treatment of bilateral vocal cord paralysis. 2) In experimental group, vocal cord was noted to be abducted during quiet and deep respiration except one dog which adductor branch was thought to be avulsed from the PCA muscle. 3) In control group, angulation of the vocal cord during deep inspiration was even more decreased than during quiet one. In experimental groups, angle of the vocal cord was increased during deep inspiration. This results suggest that selective section or direct implant of adductor branch may be an effective surgical procedure in some cases with bilateral vocal cord paralysis. Much more research needs to be done to improve upon existing techniques designed to restore both adductive and abductive laryngeal function.