Recurrent miscarriage is defined as 3 or more consecutive spontaneous abortions with the same sexual partner. The occurrence of 2 consecutive miscarriages should be taken seriously. Recurrent abortion is one of the main causes of fertility failure in women of childbearing age. Statistics from different regions, classes and ages show that about 5% of women of childbearing age have had 2 or more miscarriages and 1% to 2% have had 3 or more miscarriages, and the risk of recurrence increases with the number of miscarriages. The causes of recurrent miscarriage are complex and varied, and lack of specific clinical manifestations. Most patients have multiple causative factors at the same time, and if the screening program is not comprehensive and appropriate treatment is not given in time, it may lead to failure of another pregnancy. However, comprehensive screening involves a large number of tests, which is not only time-consuming but also expensive. Therefore, in clinical practice, the scope of screening can be appropriately narrowed and appropriate and necessary screening items can be selected based on the length of pregnancy and fetal status in which the abortion occurred.