PCOS is the most common endocrine disorder in reproductive women. It is estimated that 5 to 10% of women of reproductive age have PCOS. One of the major diagnostic criteria of PCOS was chronic anovulation which lead to irregular menstruation, amenorrhea, and infertility; the other diagnostic criteria was hyperandrogenism which lead to hirsutism, acne and alopecia. Furthermore, PCOS is thought as a metabolic disorder, the long-term consequence of PCOS were diabetes mellitus and cardiovascular disease, which are potentially dangerous in women health. Early diagnosis and prevention is very important to the PCOS patients.