1. Transparent chest wall to have viscera in the thoracic cavity exposed such as stomach and lung; check whether the opeation is correct.
2. Compression hemostasis via Sengstaken-Blakemore tube can be trained with an open window, through which the whole process of stomach fundus compression hemostasis can be completely demonstrated.
3. Allow to operate nasal feeding, gastric lavage and stomachoscopy; simulative stomach juice can be extracted when the operation is correct; the liquid in the digestive tract can be excreted after the whole training session.
4. Available postoperative care of tracheotomy and mouth care.