Abstract: In this paper, 2460 pregnant women were selected as research objects, and the application value of ultrasound in prenatal diagnosis of pregnant women was discussed. At 20-28 gestational weeks, the fetal congenital heart disease was diagnosed by ultrasonic electrocardiogram, the abnormal fetus was examined by ultrasound at 11-32 gestational weeks, and the chromosomal invasion was performed at 18-23 gestational weeks. The results showed that the final diagnosis of 110 cases of congenital heart disease fetus, ultrasonic ECG detection of a total of 102 cases, the diagnostic accuracy rate was 92.73%. Finally, 131 cases of abnormal fetus were diagnosed, 118 cases were diagnosed by prenatal ultrasound, and the diagnostic accuracy rate was 90.08%. Chromosomal abnormalities were detected in 12 cases by chromosome invasion examination, which may be one of the factors causing fetal malformation. Therefore, prenatal ultrasound is an effective means to diagnose congenital heart disease and fetal malformation, which can play an important role in reducing birth defects.

Key words: ultrasonography, parturient, deformity, chromosomal abnormality, diagnostic value