Myasthenia gravis thymic hyperplasia or thymic tumor is a type of disease that can be treated by surgical resection. Since the thymus gland is located in the anterior superior mediastinum, adjacent to the large blood vessels, the heart and other important organ structures, the location is special and surgery usually requires sawing through the sternum for removal. Surgery is ideal for the treatment of thymic hyperplasia or thymic tumor, and it is not difficult to operate if it does not infringe on the large blood vessels of the heart, but the sternum needs to be sawed open, leaving a long surgical scar on the anterior chest wall, especially for young women, which affects the aesthetics. Therefore, we have switched to a thoracoscopic approach for this type of surgery. Thoracoscopic thymectomy is performed by making 3-4 small holes in the lateral chest wall, and the operator views the surgical site on a screen and performs the surgical excision through the operating holes. The traditional median opening requires sawing through the sternum and leaves surgical scars on the chest after surgery. Thoracoscopic thymectomy does not require sawing through the sternum or cutting off any bone, but only requires three surgical operation holes in the lateral chest wall. Since the procedure is not difficult and does not require sawing through the sternum, it does not leave an aesthetic scar and the surgical bleeding is reduced. Therefore, we recommend that thymectomy should be considered first with the assistance of thoracoscopy. However, for huge thymus tumors that involve important surrounding organ structures, median open-heart surgery should still be chosen.