Increased resistance of the left uterine artery with notching in late pregnancy refers to the obstruction of blood flow in the uterine artery on ultrasound, which may lead to the lack of nutrients needed by the fetus, thus leading to intrauterine developmental delay and other adverse outcomes. Uterine artery notching refers to ultrasound examination scanning blood vessels appear uterine artery can be seen in the early diastolic notching, indicating that the uterine artery blood flow is unstable, the occurrence of this situation may be congenital vascular development abnormality caused by, so the pregnancy should be regularly monitored in order to understand the fetal umbilical artery flow index whether to affect the baby’s development. Fetal umbilical artery flow index should be less than 1, and less than 0.8 at 28 weeks of gestation. By observing the changes in this value, we can determine whether the baby is suffering from intrauterine hypoxia, and if there is any discomfort, we should seek prompt medical attention and consult a specialist for guidance.