Fetal leakage refers to occasional vaginal bleeding after pregnancy, which may not stop dripping or may come and go without lower abdominal pain. Fetal leakage is one of the most common bleeding diseases during pregnancy and is also the earliest disease to appear among pregnancy bleeding diseases. If the bleeding does not stop, it can often lead to fetal movement disorders, fetal death in the mother's womb, abortion, miscarriage and other diseases, and can also cause fetal malformations. "Compendium of Materia Medica" says: "If the bleeding does not stop, the fetus will die if the bleeding is exhausted." Therefore, paying attention to the diagnosis and treatment of fetal leakage is the key to preventing abortion and miscarriage, and is also an important measure for eugenics.