Abstract: The polycystic ovary syndrome（PCOS） is one of the most common endocrinopathy of reproductive-aged women in Gynecology. There is increasing evidence showing that the disorder of endometrial development and the decrease of endometrial receptivity to blastocyst implantation may be one of causes contributing to the poor abilities of reproduction and the unsatisfied outcomes of pregnancy in PCOS patients. Aberrant expression of some molecules and genes in endometrium may contribute to diminished endometrial receptivity. The article reviewed the latest progress in the well-known characteristic markers of endometrial receptivity at present，such as，the steroid hormones of ovary and their receptors，cell adhesion molecules，matrix metalloproteinase，Leukemia inhibitory factor and so on.

Key words: Polycystic ovary syndrome, Embryo implantation, Histocompatibility, maternal-fetal, Gonadal steroid hormones, Cell adhesion molecules, Matrix metalloproteinases, Leukemia inhibitory factor, NF-kappa B