Anestheiologists are called upon to undertake, or to assist in the management of severe respiratory and circulatory emergencies that may occur in myasthenics or to administer anesthesia for thymectomy or other surgical procedures to be performed on myasthenic subjects. Consequently the well-trained anesthesiologists must be sufficinetly familiar with the diagnosis and treatment of myasthenia gravis to carry on the therapy. A case of anesthesia for thymectomy in myasthenia gravis was experience. During operation, 0.1% succinylcholine in dripp method was given for adequate muscle relaxation and no respiratory probelms were encountered postoperatively.