This paper discussed the syndrome differentiation and classification and treatment on recurrent spontaneous abortion(RSA)caused by polycystic ovary syndrome(PCOS),and summarized that heart,liver,spleen and kidney were related to this disease,the syndrome differentiation was mainly kidney deficiency combined with phlegm dampness,stagnated fire and blood stasis. The therapy follows the principle of treatment by stages. Before pregnancy,the treatments emphasize the pre conditioning and removal of pathogens,and mainly concentrate on nourishing kidney and regulating chong meridian,combined with strengthening spleen and dispelling dampness,soothing liver and clearing away heart-fire,activating blood and resolving stasis. After pregnancy,the treatments insist on medication and concentrate on nourishing kidney and supplementing qi,reinforcing and supporting the fetus. Meanwhile,it encourages patients to adjust the life style and balance the diet,which reflect the diagnosis and treatment thoughts of “preventive treatment of disease” and “individuation” in traditional Chinese medicine.