Ultrasound examination in late pregnancy is based on the physical property of ultrasound, and the imaging examination of the fetus and its appendages in the mother is a common, safe and repeatable method for prenatal examination. Ultrasound examination is widely used in late pregnancy, which provides clinical information of fetal growth and development, thus further improving the quality of birth population. By analyzing the correlation between ultrasound parameters (heart rate, placental maturity, amniotic fluid index, umbilical cord blood flow) in late pregnancy and neonatal birth status, it is determined whether ultrasound parameters affect neonatal birth status and the analysis of their influence degree, so as to clarify the significance of relevant parameters in predicting neonatal birth status, provide important basis for early clinical intervention and improve the quality of neonates.