Abstract: Polycystic ovary syndrome is the most common endocrine disorder in women of reproductive age. Women with PCOS， with many characteristics of pathology and pathophysiology，are considered to have the increased risk of pregnancy loss. Those women are easily complicated by gestational diabetes，pregnancy-induced hypertensive disorders and multiple pregnancy. It is important to fully understand the risk factors of the pregnancy loss and pregnancy complications in PCOS patients， to take preventive measures as soon as possible for improving the pregnancy outcome.

Key words: Polycystic ovary syndrome, Abortion, spontaneous, Pregnancy complications, Pregnancy outcome, Universal precautions