The absence of end-diastolic blood flow signal at 17 weeks of gestation suggests that the fetus is at risk of intrauterine hypoxia. In general, the umbilical cord of the fetus has three blood vessels: an umbilical vein and two umbilical arteries. The vein transports oxygen and nutrients. The arteries transport metabolic wastes and carbon dioxide. In view of the fact that 17 weeks of pregnancy coincides with an important period of fetal growth and development, the absence of end-diastolic flow signals suggests that the fetus is at risk of intrauterine hypoxia, and it is recommended that the fetus be seen in the hospital as soon as possible. Therefore, it is recommended that pregnant women should pay attention to rest throughout pregnancy, reasonable nutrition, avoid exposure to radiation, avoid taking drugs during pregnancy, and regularly monitor fetal growth and development. Once bleeding, fluid, abdominal pain, abnormal fetal movement and other discomforts occur, go to the hospital as soon as possible, under the guidance of the doctor for symptomatic treatment and care, so as to avoid delaying the condition, leading to more serious consequences.