In this study, different contents of corn stover lignin were used to blend with epoxy resin at 100 oC to modify the epoxy resin. The effect of content of lignin on the properties of the modified epoxy resin was studied by the characterization of the viscosity of modified resin, and the mechanical properties, dynamic mechanical analysis, the thermal stability and the combustion properties for modified resin cured by polyamine. The results show that, with the increase of the content of the lignin, the viscosity of the modified epoxy resin increases, and the bending strength for the cured epoxy resin first increases and then decreases. The impact strength decreases with the increase of the content of lignin. The glass transition temperature for cured epoxy resin increases with increasing the content of lignin, and the thermal stability for modified epoxy resin is also improved. The addition of lignin can improve the flame retardancy of epoxy resin.