Postpartum placenta residue can cause a lot of harm to the mother. A, postpartum bleeding, postpartum placenta residual women will show the symptoms of continuous bleeding or haemorrhage, so once found placenta residual, should promptly perform the operation to remove the uterus. Second, postpartum infection, if the placenta remains for a long time, without timely clearance, it is easy to cause infection. The manifestation is vaginal discharge with odor, uterine body pressure pain, rebound pain, which will cause maternal fever, elevated blood picture, and even cause infectious shock. Third, the uterine cavity adhesions, if the placenta residue for a long time will have the symptoms of infection, even after the clearance of the uterus may cause the uterine cavity adhesions. Fourth, anemia, placenta residue will lead to increased vaginal bleeding, causing the symptoms of maternal anemia. Therefore, the health care workers should carefully pair up the placenta after delivery to observe whether the placenta is intact, and if the placenta is found to be residual, the uterus must be cleared in time.