The etiology of polycystic ovary syndrome is complex, the clinical manifestations are diverse, and the diagnostic criteria are not completely uniform. It is a complex disease and the current view is that polycystic ovary syndrome occurs due to a combination of genetic and environmental factors. Genetic factors: As early as 1935, Dr. Stein and Dr. Leventhal described a syndrome of amenorrhea, hirsutism and bilateral polycystic enlargement of the ovaries without ovulation, which was defined as S-L syndrome. With the increasing understanding of the disease, many studies have found a familial aggregation in the development of PCOS, which means that the risk of PCOS in the first-degree relatives of the patient is clear.