Background In recent years, Mongolian cardiac surgery, which included many people who have contributed to the history of development? One of them is an academician T.Shagdarsuren, whose historic feat is exceptional. He spent the great times of scientifi c, hospital, surgical fi eld. The coursework is continuing to learn and study from the experienced person. It is an essential example for our younger generations. Objective To study the history of cardiac surgery of the world and an academician Tundev Shagdarsuren’s contributions to the development of the Mongolian cardiac surgery Materials and Methods Major methodological principles have been made by anthropology and history, text sources, analytical methods, that to analyze T.Shagdarsuren’s biographies and works related to the archives, to fi nd some materials scientists at the Institute of Medicine, researchers and memories of his disciples’ talk and texts. As well as research work and time were done in to the correct order due to enrich other works of the additional information in according to rules of conducting medical research discipline. Results T.Shagdarsuren established thoracic surgical department of the fi rst surgical hospital in Mongolia in 1954. Furthermore, he did the fi rst thoracic surgery and cardiac surgery in this department. Cardiac surgical treatment is resolved some of the priority issues. As a result, with the advent of thoracic surgery of medical care for sick people closer, improved surgery techniques. Therefore, Cardiovascular research for improving the quality of medical diagnosis, which is achieved a new approach to medical practice by introducing. Conclusion: Academician T.Shagdarsuren is a famous doctor and good organizer, who initially established a team for providing cardiovascular medical services including a number of surgeries. He introduced new technologies which contributed to the development of chest cavity and cardiovascular diagnosis and surgeries and allowed us to be on the same path of other countries around the world.