Excessive amniotic fluid in 38 weeks of pregnancy can directly affect maternal health, and the hazards are as follows: 1, leading to diaphragm upward, heart pressure, some pregnant women can not lie down at night, and even induce cardiac insufficiency; 2, compression of lower limb veins, resulting in poor venous return, obvious edema; 3, poor fetal articulation into the pelvis during delivery, the fetus in the uterus is prone to running position, and even from head position to breech position, transverse position, resulting in fetal position 4, too much amniotic fluid during delivery is a high-risk factor for serious complications of amniotic fluid embolism, which is manifested as allergic reaction of the whole body caused by the amniotic fluid entering the maternal blood, with high mortality and low success rate of resuscitation; 5, too much amniotic fluid makes the uterus be propped up, which easily leads to weak contractions and postpartum hemorrhage in the process of delivery.