Fetal movement is an important indicator of the fetal well-being in the uterus. Abnormal fetal movement is one of the main manifestations of fetal hypoxia. Abnormal fetal movement includes excessive fetal movement and decreased fetal movement. There is no exact standard for excessive fetal movement, and it varies according to the fetal movement that pregnant women usually feel. Fetal movement count less than 10 times every 12 hours is considered as decreased fetal movement. In case of hypoxia, the fetal movement first appears to be too frequent, then the fetal movement decreases or even disappears, and the fetal heartbeat disappears within 24 hours after the fetal movement disappears. Fetal movement is the activity of the fetus impacting the uterine wall in the uterine cavity, which is one of the objective signs reflecting the life of the fetus. Pregnant women can usually perceive fetal movement at 16-20 weeks of gestation. The number of fetal movements is not constant, 28-38 weeks of gestation is the period of active fetal movements (normal fetal movements should not be less than 3-5 times per hour, the number of fetal movements for 12 hours is 30-40 times), and then slightly weakened until delivery. The month of pregnancy, sound and light stimulation, the amount of amniotic fluid, maternal movement, posture, emotions, etc., may cause changes in fetal movement. Some pathological conditions or dysfunction may lead to fetal hypoxia in utero and abnormal fetal movement. The diagnostic process of abnormal fetal movement. The method of counting fetal movement: the pregnant woman counts fetal movement for 1h in the morning, in the afternoon and in the evening, and the sum of 3h fetal movement multiplied by 4 is the number of 12h fetal movement. If the number of fetal movement is less than 30 times in 12h, it means that the number of fetal movement is reduced, if the number of fetal movement is more than 50% of the previous day, it means that the fetal movement is too frequent. Abnormal fetal movements can be used as a warning sign of imminent danger to the fetus. However, fetal movement is a subjective feeling, which is affected by the personality, sensitivity, work nature, amniotic fluid volume, abdominal wall thickness, placental position, medication, fetal activity and whether the pregnant woman takes it seriously. Therefore, prenatal monitoring is needed to make a comprehensive decision. Abnormal fetal movement is one of the indications for prenatal monitoring, and prenatal monitoring techniques can be broadly classified into the following categories: ① assessment of fetal movement; ② fetal heart monitoring with or without induced contractions; ③ ultrasound detection of fetal activity and amniotic fluid; ④ fetal umbilical blood flow monitoring. The choice should be made based on the potential risk to the fetus and the current level of technology. There are various methods of fetal movement counting, but so far there is no clear evidence to show which method is better. (1) Cardiff method: Start counting from 9:00 on the drought and record the time needed for 10 fetal movements. The pregnant woman should be in sitting position or lying down. If the number of fetal movements is less than 10 by 21:00 at night, further evaluation should be done. (2) Sadovsky method: 1h after meal, the pregnant woman should sit or lie down, and count the fetal movements in 1h, there should be 2 times normally; if there is no fetal movement in 1h, continue to count the fetal movement in the next hour, if it still cannot reach the birth time, then further evaluation should be done. 2.No Stress Test (NST) The NST is a fetal heart rate monitoring for 20~40min while the mother is lying on her left side. The baseline normal fetal heart rate is 110~160/min. For fetal monitoring at >32 weeks of gestation, two or more accelerations of more than 1 5/min for 15s and above within 40 min can be considered as normal NST. For fetal monitoring at <32 weeks of gestation, two or more accelerations of more than 10/min for 10s and above within 40 min can be considered as normal NST. 3. Contraction stress test (CST) is used to induce contractions by exogenous contraction cord or stimulation of nipple, and record the change of fetal heart rate within 20 min; however, it is contraindicated for pregnant women who cannot deliver vaginally. Fetal heart rate baseline 110-160/min, baseline variability of moderate variability, presence of spontaneous acceleration, no deceleration or occasional non-complex variability deceleration and dry phase deceleration are considered normal CST. 4. Ultrasound examination of fetal activity and amniotic fluid (Manning score) Ultrasound can record fetal activity and physical characteristics. The biophysical score is to assess the biophysical characteristics of the fetus by fetal movement (FM), respiratory movement (FBM), muscle tone (FT) and amniotic fluid volume (AFV) within 30 minutes. Fetal umbilical flow monitoring is not a routine monitoring method and is indicated mainly for specific groups of pregnant women, such as those with fetal growth restriction or combined gestational hypertensive disorders. In normal pregnancy, as the gestational week increases, the uteroplacental blood flow increases, the number of tertiary villi and their tiny arteries gradually increases, resulting in a gradual decrease in placental vascular impedance, and a decrease in the peak systolic/minimum diastolic flow (S/D) and resistance index (RI) values, when the umbilical vascular resistance increases abnormally, the placental circulatory resistance increases, the fetus has insufficient blood supply and is in a chronic The higher the S/D value, the greater the risk to the fetus, and even fetal death in utero. The higher the S/D value, the greater the risk of fetal death and even intrauterine death. The end-diastolic blood flow cut-off is an extreme form of umbilical blood flow alteration, which means that the placental circulation is in a high impedance state, a sign of severe fetal hypoxia and a poor prognosis. The average value of normal umbilical blood flow at 22 weeks is 3.5 and the upper limit is 4.25. Exceeding this value is considered abnormal. After 30 weeks of gestation, intrauterine distress occurs when the S/D of umbilical artery is >3,0, PT is >1,7 and RT is >0,7. The management process of fetal movement abnormalities.