Normal vocal fold movement is accomplished by two systems: the cricoarytenoid system and the cricoarytenoid system. The cricoarytenoid system is centered on the cricoarytenoid joint and is innervated by the superior laryngeal nerve to the cricoarytenoid and arytenoid muscles, which are responsible for the lengthening and shortening of the vocal folds, thus maintaining vocal fold tension during vocalization. The cricoarytenoid system is centered on the cricoarytenoid joint, with the posterior cricoarytenoid, lateral cricoarytenoid and transverse cricoarytenoid muscles innervated by the recurrent laryngeal nerve, which are responsible for the opening and closing of the vocal folds inwardly and outwardly. When this coordination function is disturbed, vocal fold movement disorder occurs. 1.Vocal fold hypertonic vocal fold dyskinesia: such as rigid closure insufficiency, which occurs when the vocal folds are closed and bulky. 2, posterior wall closure dyskinesia type of vocal folds posterior 1/2-1/3 is triangular closure dyskinesia. 3, posterior end type of malocclusion, the posterior 1/3 of the vocal folds are triangular malocclusion, is the interarytenoid muscle out of control. Weakened vocal dysfunction: the main manifestation of vocal weakness, vocal fatigue, sound intensity is weakened. If the weakening of the cricoarytenoid system is predominant, there is a pike-shaped suture in the vocal folds, and the vocal folds are hypotonic. In case of interlobar muscle weakness, the posterior end of the vocal folds are not fully retracted, and a triangular closure is poor. The licensure is purely a muscle injury and is not a neurologic paraplegia. When there is atrophy of the muscle, hooked vocal folds may form. General causes and abuse of voice or excessive use of voice, local tissue hypoxia, local metabolic disorders, the occurrence of vocal fold mucosal congestion, edema, followed by the gradual increase in the vocal folds can appear laryngomalacia, laryngeal joint pain, and laryngeal arthritis should be differentiated from the laryngeal arthritis!