The treatment of recurrent miscarriage (commonly known as habitual miscarriage) can be considered a major “problem” in the medical field, and doctors are at their wits’ end in the face of many infertility patients. With the increasing research in reproductive immunology, there is a new understanding of the causes of recurrent miscarriage, and the causes of recurrent miscarriage are unknown in about 50% of cases. In this session, the diagnosis and treatment of recurrent miscarriage will be described in detail. Recurrent miscarriage (RSA) is one of the common gynecological diseases, which refers to two or more consecutive or non-consecutive spontaneous miscarriages, each often occurring in the same gestational month. According to statistics, the incidence is about 1%-5% among married women. Therefore, it is very important to investigate the cause of miscarriage and to adopt suitable and effective treatment according to the cause.