Abstract: Polycystic ovary syndrome（PCOS） is the gynecologic endocrine diseases characterized by chronic anovulation and hyperandrogenism. The women with PCOS may be complicated with vitamin D deficiency. Many clinical trials in recent years indicated the association between 25-hydroxy vitamin D [25（OH）D] level and PCOS, including insulin resistance，ovulatory dysfunction，menstrual irregularities，low pregnancy success，hirsutism，hyperandrogenism，obesity and the elevated risk factors of cardiovascular diseases. Vitamin D deficiency may play an important role in aggravating symptoms of PCOS. The preliminary clinical data suggested the possible benefits of vitamin D supplementation in women with PCOS. This review summarized the current clinical researches on the correlation between vitamin D and PCOS．

Key words: Vitamin D, Polycystic ovary syndrome, Receptors, calcitriol