Fetal cardiac monitoring deceleration refers to the occurrence of early deceleration, late deceleration, and variant deceleration of the fetal heart during fetal cardiac monitoring, and different decelerations represent different meanings. Early deceleration is due to increased intracranial pressure caused by pressure on the fetal head during contractions, resulting in decreased oxygen supply and blood flow to the brain and decreased oxygen partial pressure and increased parasympathetic activity. It generally does not cause adverse maternal or fetal outcomes and is of no clinical significance, so labor or delivery can continue. Variable deceleration is caused by transient compression of the umbilical cord or the fetus itself during contractions, and the effect on the fetus depends on the degree and duration of umbilical cord compression during contractions. The longer the deceleration and the greater the variability, the greater the likelihood of harm to the fetus. Late decelerations are caused by a decrease in blood flow to the uterus during contractions and the resulting decrease in oxygen transfer. Based on the test results, it is possible to determine whether the baby has suffered from hypoxia or other conditions in the uterus, especially during labor, which requires a comprehensive judgment by the obstetrician, and it is recommended to consult a professional obstetrician if there is deceleration on fetal heart rate monitoring.