34 weeks of fetal heart rate monitoring once failed, can be reviewed after 0.5-1 hours, because the fetus has a wakefulness cycle, the cycle is generally 20-40 minutes, the longest not more than 1 hour, in 30-60 minutes after the fetal heart rate monitoring again, most of the fetal heart rate monitoring will be normal. If it is still not normal with abnormal fetal movement, it should be suspicious of the occurrence of intrauterine hypoxia, because fetal heart rate monitoring can predict the intrauterine reserve capacity of the fetus, and it is also one of the most common methods used by clinicians. Three consecutive abnormalities can be further fetal biological and physical scoring, that is, under the ultrasound direct observation of fetal muscle tone, respiration, fetal movement, amniotic fluid, comprehensive scoring, combined with the electronic fetal heart rate monitoring, comprehensive judgment of intrauterine hypoxia occurred or not.