Placental hypoplasia occurs before 28 weeks of pregnancy, if there is no obvious bleeding can look forward to treatment, avoid strenuous exercise and life. If placenta previa occurs at 34 weeks of gestation, fetal movements should be counted in detail, and if there is no bleeding, appropriate physical activities can be performed without absolute bed rest. Those who have bleeding and lower abdominal pain should go to the hospital in time. If the hematocrit is <70g/L, blood transfusion should be given, along with diazepam for sedation, hemostatic minerals, hemostatic fontic acid for hemostasis, as well as suppression of contractions. If fatal hemorrhage occurs, transfer to a higher hospital if necessary, and at the same time, promote fetal lung maturation, inhibit contraction treatment, and give adequate preparation, notify the higher hospital for blood preparation and emergency rescue.