After 20 weeks of gestation or during delivery, the normal position of the placenta is partially or completely detached from the uterine wall before the delivery of the fetus, which is called placental abruption. Placenta abruptio causes rapid and fast progression and can endanger the life of mother and child if not treated in time. Placental abruption is mostly caused by hypertension (20%). Pregnant mothers with high blood pressure are 5 times more likely to have placental abruption than the average pregnant mother. Placenta abruption can also be triggered by mechanical factors (15%), such as impact on the stomach, sudden braking collision, falling stomach first and being beaten. In addition, placental abruption can be caused by short umbilical cord, external rotation of the fetal position, amniotic cavity puncture when the placenta is located in the anterior wall of the uterus, or too rapid delivery of the first fetus in twin pregnancies. In addition, excessive amniotic fluid occurs with premature rupture of membranes (20%) and smoking) (15%) are also important precipitating factors of placental abruption. The typical symptoms of placental abruption are uterine pressure (73%), uterine hardness (72%), vaginal bleeding (71%) and abdominal pain (71%). In mild placental abruption, vaginal bleeding and mild abdominal pain are predominant, placental abruption does not exceed 1/3 of the placenta, and fetal heartbeat is mostly normal unless there is too much bleeding; it can also be asymptomatic and only clot pressure is found at the abruptio when the placenta is examined after delivery. Severe placental abruption is dominated by internal bleeding and mixed bleeding, with the placental abruption surface exceeding 1/3 of the placenta, along with a large retroplacental hematoma, mostly seen in severe hyperemesis. Severe placental abruption often presents with sudden onset of persistent abdominal pain, lumbago, uterine hardness like a plate, refusal to press, the larger the hematoma the more intense the pain, only a little or no vaginal bleeding, the degree of anemia does not match the amount of external bleeding. The uterine pressure pain is most obvious at the placental attachment, if the placenta is in the posterior wall of the uterus, then the pressure pain will not be obvious; the uterus is larger than the same gestational week and will keep getting larger as the hematoma increases; the uterus cannot relax between contractions and the fetal position is not clearly palpable. If the placental abruption surface is more than 1/2, the fetal heart has mostly died, so the fetal heart of heavy placental abruption has mostly disappeared. Once placental abruption occurs, the pregnancy should be terminated immediately. In order to buy time, usually choose cesarean delivery. To prevent placental abruption, you should strengthen prenatal checkups, monitor blood pressure, eat a low-salt, low-fat diet, quit smoking, actively treat hyperemesis and chronic nephritis, not wear high-heeled shoes, and avoid abdominal trauma such as prolonged lying down and falling during late pregnancy.