A prolonged abortion, i.e., an indeterminate abortion, usually results in a blood clot that cannot be removed. An indeterminate abortion is one in which the embryo or fetus has died and remains in the uterine cavity without being eliminated in time. Miscarriage may occur with or without symptoms. When there are symptoms of pre-eclampsia, there will be a small amount of vaginal bleeding, some of which is still in the uterus and has not been expelled; when there are no symptoms, they are detected by the doctor during the examination. When the abortion is prolonged, the placental tissue is mechanized and adheres closely to the uterine wall, making scraping difficult. Blood count, platelet count and coagulation function should be checked before treatment, and blood transfusion should be prepared. If the coagulation function is normal, estrogenic drugs can be taken orally for 3 to 5 days to improve the sensitivity of uterine muscle to hysterin. The uterus <12 gestational weeks, feasible scraping, intraosseous injection of uterotonin, the operation should be particularly careful to avoid perforation of the uterus, a time can not be scraped, in 5 ~ 7 days after the scraping; uterus ≥ 12 gestational weeks, can use mifepristone plus misoprostol, or intravenous injection of uterotonin, to promote the expulsion of the fetus, the placenta. After the discovery of fetal arrest, you need to consult a doctor in time to avoid life-threatening situations.