The normal values of uterine artery SD on both sides of the uterine artery vary slightly at different times. The normal value of uterine artery SD is 2.62-0.85 when not in pregnancy and decreases with increasing gestational weeks after pregnancy. Elevated resistance indicates inadequate perfusion of uterine and placental blood flow. Uterine artery blood flow is an important indicator for evaluating uterine and placental blood circulation and is frequently checked in patients with hyperemesis. After pregnancy, pay attention to regular obstetric checkups, pay attention to a reasonable diet, do not eat cold, spicy and stimulating food, keep a relaxed mood, regular rest and rest, try not to stay up late so as not to affect fetal development, exercise appropriately, pay attention to fetal movement, and promptly check if the activity is faster or slower.