The most obvious symptom of placental hypoplasia is the occurrence of unprovoked, painless and recurrent vaginal bleeding in late pregnancy, i.e. the abdomen is completely painless when vaginal bleeding occurs. The reason for this is that as the uterus grows, the placenta, which is attached to the lower part of the uterus and the cervical area, cannot extend accordingly and causes misalignment and separation resulting in bleeding. Hypoplastic bleeding usually occurs late, mostly near the due date or after labor, and the initial bleeding is usually small. As the lower uterine segment continues to stretch, bleeding tends to occur repeatedly and in increasing amounts. As a result of repeated or heavy vaginal bleeding, the patient may become anemic, and the degree of anemia is proportional to the amount of bleeding, and severe bleeding may lead to shock, fetal hypoxia, or even intrauterine death. When there is a lot of bleeding, the patient may show signs of hemorrhagic shock such as anemia, increased pulse rate and decreased blood pressure. Therefore, patients with hypoplastic placenta should absolutely rest in bed, correct anemia and use antibiotics to prevent infection as prescribed by the doctor. If the gestational week is less than 34 weeks, measures can be taken to suppress contractions and appropriate drugs can be given to promote fetal lung maturation. At the same time, closely observe the patient’s condition and perform relevant auxiliary examinations. In case of repeated heavy bleeding, the pregnancy should be terminated as appropriate to avoid endangering the life of mother and fetus.