The criterion of increased amniotic fluid refers to the amount of amniotic fluid exceeding 2,000 milliliters during pregnancy. During normal pregnancy, the production and absorption of amniotic fluid is in a dynamic balance, and if there is an imbalance between the production and absorption of amniotic fluid, it may result in an abnormal amount of amniotic fluid. If the amount of amniotic fluid exceeds 2,000 milliliters, it means that the amount of amniotic fluid is excessive. Excessive amniotic fluid can be caused by a variety of reasons, such as fetal structural abnormalities, fetal tumors, metabolic disorders, chromosomal or genetic abnormalities, etc., which may lead to excessive amniotic fluid. Placenta in multiple pregnancies, umbilical cord pathology, gestational diabetes mellitus, and Rh blood group incompatibility between mother and child may also lead to excessive amniotic fluid. When excessive amniotic fluid is detected, it is necessary to rule out whether the fetus has structural abnormalities and hereditary disorders, that is, to do an exclusion test first. If the fetus has serious structural abnormalities or chromosomal abnormalities, the pregnancy needs to be terminated. If the fetus is normal, you need to actively find the cause of the disease and treat the original disease, for example, if there is gestational diabetes, the pregnant woman should control her blood sugar.