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Abstract. Introduction of nanoparticles into bioreactor could improve methanogens activities in solid-state anaerobic digestion. This mesophilic study examined the impact of Fe₃O₄ nanoparticles (Fe₃O₄NPs) on reactor performance when calcium pretreated corn stover (CaCs) was co-digested with dairy manure (Dm). Hence, three concentrations of Fe₃O₄NPs (20, 50, and 75 mg) were introduced into the bioreactors and the treatments were 20CaCsDm, 50CaCsDm, and 70CaCsDm, respectively. This study indicated that the addition of Fe₃O₄NPs reduced the hydraulic retention time (HRT) by 27 days compared to the control, as well as an earlier adaption of methanogens. Furthermore, treatment 20CaCsDm had the highest methane yield (191.16 L / kg VS) for the 52 days HRT, about 7% more than the control. Hence, based on this study, the addition of Fe₃O₄NPs to the blend of calcium pretreated corn stover and dairy manure have the potential to improve reactor performance in an initially upset solid-state anaerobic digestion.