An amniotic fluid index of 77mm at 39 weeks of pregnancy does not require hospitalization, but requires close monitoring of changes in the amniotic fluid index on an outpatient basis. At present, it is believed that ultrasonography amniotic fluid maximum depth (AFV) ≧ 8cm, or amniotic fluid index (AFI) ≧ 25cm, for excessive amniotic fluid; AFV ≦ 2cm, AFI ≦ 5cm for amniotic fluid is too little, amniotic fluid index of 77mm, is still within the normal range, do not need to be hospitalized, but need to be outpatient close monitoring of changes in amniotic fluid index and fetal movement, such as amniotic fluid index is as low as 5cm and below, or If the amniotic fluid index falls to 5cm or below, or if the fetal movement is frequent or decreases, hospitalization is required at any time. In normal pregnancy, the production and absorption of amniotic fluid is in a state of dynamic equilibrium. If the amniotic fluid is in the normal range, there is no need to worry too much, and regular checkups will be sufficient. If the ultrasound suggests that the amniotic fluid is too much or too little, you should consult the doctor in the hospital in a timely manner, to rule out abnormalities of the development of the fetus, abnormalities of the placenta of the umbilical cord and maternal complications, and at the same time, monitor closely the situation of the mother and child and actively treat the condition.