High umbilical artery blood flow at 30 weeks may be caused by fetal malformation, umbilical cord abnormality, and intrauterine distress. It can be treated by oxygen intake, change of body position and termination of pregnancy as prescribed by the doctor. 1. Fetal malformation: If there is congenital disease in the fetus, it may affect the resistance of umbilical artery, which may lead to the situation of high blood flow in umbilical artery at 30 weeks. In this case, ultrasound and other examinations should be performed to clarify whether the fetus has malformations, and if it is more serious, the pregnancy should be terminated in time. 2. Abnormal umbilical cord: if there is umbilical cord entanglement, the umbilical cord is too long, too short, too thin, etc. may affect the circulation of the placenta, resulting in 30 weeks of high blood flow in the umbilical artery. At this time, close observation should be made, and if the condition is not relieved by oxygen intake, change of position, etc., the pregnancy should be terminated in time. 3. Fetal intrauterine distress: if the fetus in the uterine cavity appears hypoxia, should be timely treatment, correct the fetal hypoxia, give the pregnant woman oxygen, the left side of the lying position, correct the low blood pressure of the pregnant woman, etc., if the symptoms can not be improved, should be timely termination of pregnancy. If there is 30 weeks umbilical artery blood flow is high, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or standardized treatment.