Placental abruption is defined as partial or total detachment of the normally positioned placenta from the uterine wall after 20 weeks of gestation or during labor before delivery of the fetus. According to the typing of bleeding characteristics, it can be divided into dominant and occult abruption. If the placental hemorrhage washes away the edge of the placenta and the fetal membranes and flows out through the cervical canal, it is a dominant abruption. If the placental rim or membranes do not detach from the uterine wall, or if the fetal head enters the pelvic inlet and presses on the lower edge of the placenta so that blood accumulates between the placenta and the uterine wall without vaginal bleeding, it is a hidden abruption. Occult abruption often leads to more serious consequences, and because the bleeding is more insidious, detection of placental abruption is delayed. The time it takes for the pregnant woman to receive treatment is correspondingly longer, and the duration of the bleeding increases, causing more harm to both the woman and the fetus.