Amniotic fluid depth of 80mm at 37 weeks is normal. Normal amniotic fluid maximum depth dark zone in pregnancy in 30 ~ 80mm, in the pregnancy before 28 weeks the fetal volume is relatively small but amniotic fluid is relatively large, so the fetus in the uterine cavity in the range of activities is relatively large. With the increase in gestational age, to 37 weeks of gestation, the fetal development faster volume increases, the amount of amniotic fluid is relatively reduced. Therefore, the amniotic fluid depth of 80mm at 37 weeks of pregnancy is within the normal range. In the late stages of pregnancy need regular checkups, do a good job of obstetrics, observe the amount of amniotic fluid, amniotic fluid is too much or too little need to be further checked, at the same time, diet and nutrition should be reasonable, there are abnormalities in a timely manner to the hospital.