PCOS (Polycystic ovary syndrome) is a common endocrine condition with reproductive and metabolic consequences, including anovulation, infertility. Women with PCOS usually experience pregnancy complications like gestational diabetes (GDM), gestational hypertension, preeclampsia, preterm and caesarean delivery. PCOS is a syndrome of ovarian dysfunction and its basic features include hyperandrogenism and polycystic morphology. lifestyle modifications are regarded as the cornerstone of all interventions against PCOS. Lifestyle modifications (including diet, exercise, sleep, and so on) are regarded to play roles in the development of PCOS by regulating insulin sensitivity and keeping the weight balanced as well as governing normal androgen production. In this review, we provide an overview of Pregnancy Complication with PCOS highlight some of the major consequences, and discuss preventive measures.