In general there are three operative methods for medial displacement of the vocal cord in unilateral vocal cord paralysis or vocal cord atrophy. The intracordal injection of Teflon or other materials is the most popular surgical technique used for unilateral vocal cord paralysis, and the greatest advantages of cordal injection are its surgical simplicity and the satisfactory results obtained in most cases, but there are several disadvantages. Isshiki proposed various types of thyroplasty as a treatment for dysphonia, and he introduced thyroplasty type I successfully for unilateral vocal cord paralysis or vocal cord atrophy. Surgical adduction of arytenoid cartilage is indicated when glottal chink is large or the paralysed cord is fixed at a lateral position ; this method has more effectively adducted the fixed cord than thyroplasty type I, and it can correct any level difference between the two cords. The disadvantages of arytenoid adduction are technical problems and longer surgical time. So authors tried to correct the abnormal voice in 12 cases of unilateral vocal cord paralysis with above three techniques. On cordal injection in two patients, the authors used the silastic gel instead of Teflon in median or paramedian vocal cord pasition with cord atrophy. On thyroplasty type I in five patients who revealed paramedian position or intermediate position, authors performed using thyroid cartilage and silastic shim in all cases. On arytenoid rotation, five patients showed intermediate position of vocal cord. So, it seems reasonable to be considered that each techniques should be adjusted depending on the position of the vocal cord and existence of cord atrophy.