Recurrent miscarriage is a phenomenon that occurs when two or more pregnancies are miscarried. Once a recurrent miscarriage occurs, it is important not to rush to get pregnant but to check the cause carefully. In order to avoid recurrence of miscarriage. 1, to understand the medical history, gynecological double examination and other examinations; check the routine white belt, mycoplasma, chlamydia, if necessary, such as sexually transmitted diseases; 2, ultrasound examination to understand the endometrial situation, monitoring ovulation; 3, menstruation to check the hormone level (sex hormone six), thyroid function, blood sugar, insulin levels, etc.. 4, routine blood, blood type (ABO/Rh), TORCH (toxoplasmosis, rubella virus, cytomegalovirus, herpes simplex virus, etc.), etc.; female blood type O. Also need to check the male blood type; 5, immune-related antibodies: cardiolipin antibodies, lupus anticoagulant, anti-sperm antibodies, anti-endometrial antibodies, anti-ovarian antibodies, anti-trophoblast antibodies, anti-thyroid antibodies, closed antibodies, ABO blood group antibodies (optional), etc.; 6, male sperm quality check; 7, chromosome examination of both sides; 8, hysteroscopy, laparoscopy, etc. if necessary. The above is for reference only, the examination items depend on the person, the doctor will choose the examination according to your situation, and some hospitals may not carry out all the examination. In addition to the above, there may be some unknown causes that cannot be detected at present. It is recommended to use a combination of Chinese and Western medicine to preserve the pregnancy as early as possible to improve the conception rate.