The so-called sail-shaped placenta is the straight umbilical cord attached to the fetal membranes, blood vessels through the fetal membranes like a fan-shaped distribution into the placental tissue, the incidence of twin pregnancies is relatively high, the sail-shaped placenta is impossible to be corrected. Sail-shaped placenta has no effect on the pregnant woman herself, but it has a very big effect on the fetus. If the umbilical cord attachment point is close to the lower edge of the placenta and close to the mouth of the uterus, the prenatal part of the umbilical cord may press on this place and cause intrauterine hypoxia or even cause clinical death. Therefore, it is recommended to go to the hospital regularly to give the appropriate checkups to the sail-shaped placenta, and once there are corresponding symptoms, such as intrauterine hypoxia or bleeding, it is recommended to deliver the baby by cesarean section.