Fetal hypoxia can be divided into acute hypoxia and chronic hypoxia, and is a combination of health and life threatening conditions. Acute fetal hypoxia occurs mainly during labor and delivery and is determined by monitoring the fetal heart rate and fetal movement. In addition to monitoring fetal heart rate and fetal movement, chronic fetal hypoxia can also be determined by fetal biophysical score. Acute fetal hypoxia mainly occurs during labor, mostly caused by umbilical cord abnormality, placental abruption, excessive contractions, prolonged labor and shock, etc. The symptoms are as follows: 1. abnormal fetal heart rate: no variation in fetal heart rate baseline, and repeated late deceleration, variation deceleration or fetal bradycardia (fetal heart rate baseline <110 beats/min), i.e. Class III electronic fetal heart monitoring graphic. 2, amniotic fluid and fetal fecal contamination: continuous electronic fetal heart monitoring should be considered when there is amniotic fluid and fetal fecal contamination, and if the fetal heart monitoring is abnormal, it suggests the presence of intrauterine hypoxia. 3, abnormal fetal movement: fetal movement is frequent at the beginning of hypoxia, then weaken and decrease in number, and then disappear. Chronic fetal hypoxia mainly occurs in late pregnancy, often continues until delivery and worsens, mostly due to gestational hypertension, chronic nephritis, uncontrolled diabetes, etc. The symptoms are as follows: 1, fetal movement decreases or disappears: fetal movement decreases as an important manifestation of fetal hypoxia, if fetal movement count ≥10 times/2 hours is normal, <10 times/2 hours or decreases by 50%, suggesting the possibility of fetal hypoxia. 2.Abnormal prenatal electronic fetal heart monitoring: abnormal No Stress Test (NST) indicates the possibility of fetal hypoxia. 3.Low fetal biophysical score: Ultrasound examination is performed first, and the result data is analyzed to get the fetal biophysical score, ≤4 points suggest fetal hypoxia, 5-6 points are suspected fetal hypoxia.