Ten cases of ptosis from myasthenia gravis were treated by an horing myocutancous flap from upper eyelid to the frontal belly of the occipito-frontalis muscle. This flap was very elastic in texture and possessed a b hanging force, and without the ill-effect of tissue rejection. It could effectively restore the function of the upper eyelid with the aid of the action of occipito-frontalis muscle. The patients were followed up from 1 to 3 years with satisfactory results.