Systemic lupus erythematosus (SLE) is a kind of systemic autoimmune disease which can cause multiple organs and system damage, which often occurs in women of childbearing age. Compared with healthy pregnant women, SLE patients have higher incidence of premature delivery, preeclampsia and fetal loss during pregnancy. Since SLE patients usually have disease activity during pregnancy and postpartum, and a variety of maternal and fetal diseases are closely related to SLE, it is very important to monitor the disease activity and drug treatment of SLE patients during pregnancy.