While the Fontan operation has improved the survival of a generation of children born with a functional single ventricle, it does not recreate a normal circulation. However, significant challenges remain. Early stage mortality risk seems stubbornly high. The risk of late cowplications seriously affect the longterm survival of children. As new techniques and therapies exist, more single ventricle patients survive till adulthood. Therefore, the limits of Fontan procedures is more and more evident. In recent years, the study of mechanical cavopulmonary assisting device, which addresses the limitations of Fontan circulation, has been developed and provided a more stable and effective biventricular of blood flow in the total cavopulmonary connection in existence. This would benefit not only the treatment of late Fontan complications, but also facilitating early surgical repair, which is promising.