Pregnant women with placenta implantation do not have any obvious conscious symptoms, but they may have difficulty in detaching the placenta during labor. Placenta implantation usually has no specific symptoms during pregnancy, but it can be detected by ultrasound after the 12th week of pregnancy when the border between the placenta and the myometrium is indistinguishable, even down to the plasma membrane layer of the uterus, in which case placenta implantation should be considered as a possibility. Placental implantation can be categorized into three types according to the degree of placental invasion, i.e. placental adhesion, placental implantation, and placental penetration, and can be diagnosed by MRI if necessary. In the first and third stage of labor are prolonged, after delivery can occur placenta implantation of the mother can occur placenta can not be peeled off, resulting in hemorrhage, and even appear in the placenta for a long time in the uterine cavity caused by infection, etc.. Bleeding and infection may also occur after delivery. It is difficult to remove the implanted part, and forcible removal of the implanted part may cause postpartum complications such as postpartum hemorrhage.