Ultrasound during pregnancy can make screening for simple congenital heart disease. The best period for fetal echocardiographic exploration is from 20 weeks to 28 weeks of pregnancy. Because of the small size of the fetal heart in the early stage, the section does not show well, and the influence of the acoustic shadow behind the developing fetal skeleton and the fetal orientation in the late stage all lead to the impact of fetal heart exploration. Fetal cardiovascular developmental abnormalities are diverse and complex in type. Although fetal cardiac ultrasonography has developed rapidly with the continuous advancement of diagnostic ultrasound instruments and the accumulation of experience and research by those who are engaged in this specialty, it is an objective fact that there are still many fetal cardiac anomalies that cannot be detected prenatally. Pregnant women should have knowledge and understanding of this area. It is believed that with the development of medical technology, more diseases will be recognized and the level of fetal ultrasound diagnosis will become higher and higher. The development in all regions of the country is becoming more and more popular, and the birth rate of children with prenatal heart disease in China will be strongly controlled.