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The activity of free radicals in follcular fluid was related to ovarian responsiveness,in vitro fertilization (IVF),and embryo transfer success rate.However,studies analyzing the relationship between the free radical scavenging capacity and embryo quality of infertile women with polycystic ovarian syndrome (PCOS) were lacking.The aim of this study was to evaluate the relationship between the free radical scavenging window of women with PCOS and their embryo quality.The free radical scavenging capacity of follicular fluid from women with PCOS was determined by a,a-diphenyl-b-picrylhydrazyl (DPPH),2,2-azinobis (3-ethylbenzthiazoline-6-sulphonic acid) assay,superoxide radical,and reactive oxygen species (ROS) assay.In the DPPH and ROS assays,the follicular fluid from grades Ⅰ and Ⅱ embryos was significantly higher than the follicular fluid from grades Ⅲ and Ⅳ embryos.The lower control limit of DPPH radical scavenging capacity and upper control limit of ROS level were 13.2％ and 109.0 cps,respectively.The calculated lower control limit and upper control limit were further confirmed in the follicular fluid of embryos of all grades.These cut-off values of free radical scavenging activity of follicular fluid could assist embryologists in choosing the development of embryos in PCOS patients undergoing.