37 weeks of pregnancy every night the amplitude of fetal movement may be physiological factors, may also be intrauterine hypoxia, excessive amniotic fluid and other pathological factors. 1. Physiological factors: If the mother is emotionally excited or has a large movement will affect the fetus, resulting in a large amplitude of fetal movement, it is recommended that pregnant women stabilize their emotions and avoid large movements. 2. Pathologic factors: (1) intrauterine hypoxia: if the fetus intrauterine hypoxia such as: the umbilical cord tangled knot, around the neck, pregnant women suffering from anemia, cardiorespiratory system diseases, will lead to intrauterine blood oxygen saturation decline caused by intrauterine hypoxia, stimulate the fetus to the uterine wall of the stimulation of the increase in the amplitude caused by fetal movement. (2) excessive amniotic fluid: if pregnant women during pregnancy combined with gestational diabetes will cause excessive amniotic fluid in the uterus, the fetus in the uterine cavity of the range of motion caused by the amplitude of fetal movement. 37 weeks pregnant every night fetal movement amplitude is large in the adjustment to stabilize mood and movement after no avail, to seek medical attention in time to avoid adverse effects.