Results: 69 cases of fetal CHD were diagnosed prenatal, 28 cases of them were confirmed by autopsy after induced Labour and 41 cases of them were confirmed by postnatal colour doppler ultrasound.

Conclusion Measurements of diameter of oval foramen and flow across it in fetal echocardiography could be an additional diagnostic standard for atrial septal defect.

Objective: To study the effective diagnostic methods and the basis of fetal congenital heart disease (CHD).