Placenta hypoplasia means that the edge of the placenta is attached to the lower part of the uterus and even covers the inner cervical opening. It is usually most dangerous after the 8th month of pregnancy, and the risk increases the later the pregnancy is. The main risk of placental hypoplasia is massive vaginal bleeding, the cause of bleeding is mainly related to contractions, because false contractions become frequent in the second trimester, and after contractions, the placenta peels off from the attachment site of the cervical os, causing blood vessels to rupture and bleed. Before 28 weeks of pregnancy, most of the placental hypoplasia will grow up naturally, after 28 weeks of pregnancy, the chance of placental hypoplasia growing up naturally decreases clearly. Once the bleeding of placental hypoplasia occurs, bed rest is needed, and magnesium sulfate can also be used to stop the bleeding by suppressing contractions, if the bleeding volume exceeds 200ml, a cesarean section is needed to terminate the pregnancy. If the placenta is low, if there is no bleeding, no special treatment can be done, pay attention to rest, avoid strenuous exercise and intercourse, keep the bowels open and reduce abdominal pressure to prevent bleeding.