Tricuspid inferior valve malformation is a rare congenital heart malformation. one case was first reported by Ebstein in 1866, so it is also called Ebstein malformation. Its incidence is 0.5-1% in congenital heart disease. Tricuspid valve inferior displacement malformation refers to a tricuspid valve malformation in which the posterior and septal valves are lower than normal, not at the level of the atrioventricular ring but down to the right ventricular wall near the apex, and the anterior valve is in a normal position, resulting in a larger than normal right atrium and a smaller than normal right ventricle, which may have incomplete tricuspid valve closure. These malformations are often combined with patent foramen ovale or atrial septal defect and pulmonary artery stenosis. Because of the high blood volume and pressure in the right atrium, some of the blood contained in the right atrium flows into the left atrium through the atrial septal defect or foramen ovale, and some of it still enters the right ventricle through the tricuspid valve. The prognosis of tricuspid inferior migration cases also varies greatly, with approximately 80% of those presenting with severe cyanosis dying at around 10 years of age, while only 5% of those with mild cyanosis die at around 10 years of age. Most of those presenting with congestive heart failure die within 2 years, and sudden death occurs in about 3% of cases. The common causes of death are congestive heart failure, arrhythmias, hypoxia or pulmonary infection. It can generally only be treated surgically, with palliative surgery and valve replacement, the former with good immediate results and the latter with immediate and long-term results.