Uterine artery blood flow needs to be tested by ultrasound for the parameters of uterine artery blood flow dynamics in order to understand the blood flow. If there is no pregnancy, the test usually needs to be performed 3 to 7 days after the menstrual period is cleared, and it is recommended that the test be performed on an empty stomach, and it is also necessary to hold urine during the test. In the absence of pregnancy, the normal value of uterine artery blood flow in women is usually between 2.62 and 0.85. In the case of pregnancy, the blood vessels of the uterus will thicken slightly in order to provide better nutrition for the fetus, so the uterine artery blood flow will be relatively higher. In general, the normal value of uterine artery blood flow during pregnancy is around 2.08~0.43. Uterine artery blood flow can reflect the blood perfusion of the uterus of the person tested, therefore, if abnormalities are found in the uterine artery blood flow test, one should go to the hospital promptly for consultation, clarification of the cause of the disease and active treatment.