Bleeding from the lower edge of the placenta covering the opening of the cervix is most often considered to be due to placenta praevia, which may lead to preterm labor, hemorrhage, and have an impact on the survival of preterm babies. Placenta praevia is primarily a condition in which the lower edge of the placenta is adjacent to or covers the endocervical opening after 28 weeks of gestation. Anterior placenta belongs to the more serious complications of pregnancy, belonging to the cause of vaginal bleeding in late pregnancy has been. If the patient’s condition is serious it can directly jeopardize the life of the mother and child. If the patient’s vaginal bleeding is heavy, it may directly lead to maternal shock, fetal distress, or even fetal death. If the placenta previa’s placental abruption surface is close to the external cervical opening, bacteria are easy to invade the placental abruption surface upward through the vagina, when the pregnant woman repeatedly bleeding and lead to anemia, the body’s resistance decreases, the puerperium is prone to infections. Therefore, once the patient has the situation of placenta praevia, need to consult the doctor in time, cooperate with the doctor to take relevant treatment measures.