The reasons for bleeding in pre-eclampsia are divided into the following categories: 1. early miscarriage: it may be that the embryo bottom meconium bleeding, surrounding tissue necrosis, sometimes the embryonic chorionic hair and uterine cavity separation, separation may be as the uterine cavity foreign body stimulation of the uterus, causing uterine contraction, causing bleeding, separation more, bleeding more, coupled with contractions, may be the discharge of pregnancy; 2. pre-eclampsia: whether early or late do not have to be too The main concern is the quality of the embryo. If the embryo has abnormal quality or chromosomal abnormalities, it may be a natural abortion. If it is late miscarriage, it should be treated by fetal preservation.