High umbilical cord blood flow is suggestive of impaired placental circulation in the fetus, which in turn leads to impaired circulation in the umbilical cord. High umbilical cord blood flow may be caused by poor placental function, sticky blood of pregnant women, or mechanical blockage of the umbilical cord, etc. It should be analyzed with specific symptoms. 1. Poor function of placenta: Poor function of placenta, such as aging of placenta, will cause obstruction of blood circulation of placenta, which will lead to obstruction of blood circulation of umbilical cord, manifesting as high umbilical blood flow. 2. Thick blood of pregnant women: Some pregnant women have thick blood and high coagulation, which makes the resistance of umbilical cord blood become bigger, and this will show high umbilical cord blood flow. 3. Umbilical cord is mechanically blocked: Mechanical blockage of the umbilical cord, such as knotting of the umbilical cord, wrapping of the umbilical cord around the neck or entanglement of the umbilical cord, etc., will also cause obstruction to the circulation of the umbilical cord, which will lead to high umbilical cord blood flow. If high umbilical blood flow is detected during labor and delivery examination, it is necessary to find out the cause and treat the symptoms in order to avoid causing intrauterine hypoxia in the fetus. If the fetus has severe intrauterine hypoxia, early termination of pregnancy by caesarean section may be required.