Double inlet left ventricle is the most common subtype of ventricle double inlet, and the predominating ventricle is left ventricle structure. Double inlet right ventricle is right ventricle type of ventricle double inlet, and the predominating ventricle is right ventricle structure. The definition of tricuspid atresia (TA) is that tricuspid valve agenesis and right ventricle hypoplasia without direct connection between the right atrium and single ventricle. There is a large variety of pathological types of functional single ventricle, each of which conduction system is also different. We will take hypoplastic right ventricle as an example to explain the anatomy of the conduction system.