Polycystic ovary syndrome is one of the most common endocrine diseases in women,which is often manifested as menstrual disorders,infertility,obesity,hairy,endometrial hyperplasia and other symptoms.The cause of polycystic ovary syndrome in western medicine has not been elucidated yet,and the treatment effect is not significant.Although traditional Chinese medicine does not have the name of polycystic ovary syndrome,its symptoms belong to the category of “menstrual period”,“menstruation less”,“amenorrhea”,“Cyst” and “infertility” in Chinese medicine.Besides,its syndrome differentiation is diverse,and treatment methods are different.The paper introduced two cases of polycystic ovary syndrome (PCOS) treated by Professor Liu Qingquan with the idea of “regulating liver and spleen,activating blood and removing stasis”.