Objective To study the effect of growth hormone(GH)with progesterone-primed ovarian stimulation(PPOS)protocol on in vitro fertilization(IVF)outcomes among women with low prognosis.Methods This is a retrospective cohort study using propensity score matching(PSM)analysis.Women commencing their IVF between January2017 to December2021,with and without GH co-treatment,were reviewed.Results After PSM,76 pairs of women with low prognosis were included into analysis.Paired testing showed there is a statistical increase in transferable embryo(P<0.001)in the GH co-treatment group comparing with control group.No significant difference showed in retrieved oocyte number and metaphaseⅡ(MⅡ)oocyte rate,two-pronuclear(2PN)zygote rate on day1,high-quality embryo rate,or clinical pregnancy rate,neither in gonadotropin(Gn)requirement,duration or peak estradiol.Subgroup analysis results showed transferrable embryo rate on day3 rising among decreased ovarian reserve women(P=0.010).For women aged below 40,MⅡoocyte rate(P=0.010)and transferrable embryo rate on day3(P<0.001)increased in GH co-treatment group.Conclusions GH is suggested a beneficial impact on oocyte quality and transferrable embryos with PPOS protocol in IVF.Its adjuvant administration can be proposed as an optional therapeutic strategy in women with low prognosis.