Fetal heart rate is lower than 150 beats/minute but higher than 110 beats/minute is normal fetal heart rate; fetal heart rate is less than 110 beats/minute, need to be analyzed comprehensively, may be early deceleration, late deceleration and variant deceleration. 1. Early deceleration: Normal fetal heart rate is 110-160 beats/min, intracranial pressure rise caused by fetal head compression during contraction leads to reduced oxygen supply and blood flow to the brain, and partial pressure of oxygen decreases to enhance parasympathetic activity. Generally, it does not cause adverse maternal and child outcomes, has no clinical significance, and can be continued in labor. 2. Late deceleration: The onset of late deceleration is delayed by contractions, which are caused by decreased blood flow to the uterus and the resulting decrease in oxygen transfer. Treatment is to increase uterine blood flow and placental-to-fetal oxygen transfer; change the position of the pregnant woman, administer intravenous fluids, administer oxygen by mask, monitor fetal pH, and prepare for labor. 3. Variable deceleration: caused by transient compression of the umbilical cord or the fetus itself during contractions; the effect on the fetus depends on the degree and duration of umbilical cord compression during contractions. The longer the deceleration, the greater the variability, and the greater the possibility of harm to the fetus. If abnormal fetal heartbeat occurs during pregnancy, it is necessary to consult a doctor for specific analysis and symptomatic treatment.