Tricuspid valve inferior displacement malformation, also known as Ebstein malformation, refers to a congenital malformation in which part or the entire tricuspid valve leaflet is not attached to the normal part of the tricuspid annulus but is spirally displaced downward and abnormally attached to the right ventricular wall. The echocardiographic manifestations of downwardly displaced tricuspid malformation are as follows: 1. tricuspid leaflet morphology and attachment site: under normal circumstances, the tricuspid septal leaflet attachment point is slightly lower than that of the anterior mitral leaflet, but the distance between the two will not be >1.0 cm; if the downward shift distance reaches 1.5 cm, it has a definite diagnostic value for Ebstein malformation, which is a more recognized diagnostic index; 2. tricuspid anterior leaflet redundancy downward shift, and examination of the tricuspid valve closure point reveals a significant cleft in the tricuspid valve closure point; 3, observe the state of partial right ventricular atrialization, because the position of the tricuspid valve closure point is obviously downward shifted, and part of the right ventricular cavity is atrialized and merged with the intrinsic right atrium to form a huge right atrial cavity; 4, observe whether there is thrombus in the right atrial cavity; 5, observe the combined malformations, such as atrial septal defect, etc. Color Doppler can be used to show tricuspid regurgitation with abnormal shunts in the cardiac chambers, spectral Doppler to measure the flow velocity and pressure difference of abnormal blood flow, and also to measure the size of each atrium and evaluate cardiac function. Echocardiography is accurate, reliable, and noninvasive for the diagnosis of tricuspid valve subluxation malformation, and is an ideal test that provides a reliable basis for surgical treatment.