Endometriosis is a condition in which the endometrium with growth function appears in other parts of the body than the mucous membrane covering the uterus, with dysmenorrhea, irregular menstruation, infertility and painful intercourse as the main clinical manifestations. It is a common disease in women of reproductive age, and its incidence of spontaneous abortion is high, averaging 40%, which is higher than the rate of spontaneous abortion in normal pregnancy. The mechanism of spontaneous abortion is complex, but the general summary is that the number of follicular receptors is reduced in patients with endometriosis, resulting in inadequate secretion and insufficient nutrition for the fetus in early pregnancy, which affects embryonic development. Secondly, the incidence of unruptured follicular luteinization syndrome (follicles that do not rupture and ovulate at a certain stage of growth but become luteinized internally) is significantly higher in patients with endometriosis than in normal women, resulting in poor ovulatory function of the ovaries and luteal insufficiency, leading to miscarriage.