Abstract: Polycystic ovary syndrome (PCOS) is an endocrine disease caused by changes in hormone levels in the body. The problem of infertility in PCOS patients that has been plagued for many years is gradually solved, and the obstetric complications are gradually increasing. some progress has made in researches for PCOS patients with gestational hypertension, gestational diabetes, and threatened abortion research. The article made a systematic review of the latest researches on obstetric complications of PCOS and its mechanism in order to provide reference for clinical diagnosis and treatment of PCOS.