Clinical ultrasound examination of amniotic fluid maximum dark zone vertical depth ≥ 80mm, can be diagnosed as excessive amniotic fluid, so when the measurement of amniotic fluid depth of 84mm, indicating that at this time for the mild amniotic fluid excess. Whether the situation is serious or not, need to be combined with the causes of amniotic fluid excess and the condition of specific analysis, more common in twin pregnancy, fetal anomalies, placental umbilical cord pathology, gestational diabetes mellitus, etc. 1, twin pregnancies: the incidence of amniotic fluid excess in twin pregnancies is about 10%, 10 times that of a single fetus pregnancy, with a single chorionic villus twin predominantly, the condition in general is not serious, but when the occurrence of the twin-fetus blood transfusion syndrome The condition is usually not serious, but when twin fetal transfusion syndrome occurs, it may lead to fetal death in the uterus, and the condition is more serious; 2. Fetal anomalies: Excessive amniotic fluid can be accompanied by fetal structural abnormalities, and neurological and digestive abnormalities are the most common ones, of which neurological abnormalities are mainly anencephaly, spina bifida, etc. In this case, the condition is more serious, and it is recommended to terminate the pregnancy; 3. Placental umbilical cord lesions: Giant placenta and umbilical cord sailing attachments can also result in excessive amniotic fluid, which is not serious under normal circumstances. When the giant placenta combined with placenta praevia, easy to lead to postpartum hemorrhage, or umbilical cord sail-like attachment leads to fetal distress, then the condition is more serious; 4, gestational diabetes: gestational diabetes amniotic fluid prevalence in 13% -36%, maternal hyperglycemia to fetal blood glucose increases, hyperosmolar diuretics, and make the placental membranes increase the exudate, leading to amniotic fluid, the severity of the disease in this case and the blood sugar The severity of the disease in this case is positively correlated with blood glucose, so pregnant women should actively control their blood glucose, pay attention to diet and exercise appropriately. Blood glucose control at normal level during pregnancy is generally not serious, but if the blood glucose is too high, it may affect the growth and development of the fetus, leading to serious consequences such as macrosomia or fetal malformation.