Fetal heart ultrasound generally uses a high-frequency probe to determine the position of the fetal heart and performs different views at specific times in order to obtain comprehensive information on fetal heart development. It includes four-chambered heart view, left ventricular outflow tract view, right ventricular outflow tract view, left ventricular long-axis view, short-axis view of the great arteries, aortic arch view and arterial ductal arch view and other arches to observe whether there is any constriction of the arterial ducts, whether there is any premature closure of the patent foramen ovale, and the blood shunt situation.