Abstract: Objective To study the effects of two different nanoparticles on the mechanical properties of selfdeveloped highstrength glass fiber reinforced lightcured resin composite posts.Methods Configure our own lightcured resin matrix,add nano ZrO2 and nano Al2O3 into resin matrix in the proportion of 1%,3%,4%,5%,make them into FRC posts by pultrusion,and universal mechanical testing machine was used to test flexure modulus,flexure strength and fracture loads of FRC posts.Results Different contents of nano particles affected the mechanical properties of FRC posts.FRC posts made of lightcured resin containing 4% nano ZrO2,nano Al2O3 had the best overall performance:flexure modulus （20.42±0.88）、（19.96±0.69） GPa，flexure strength（464.89±18.84）、（481.17±24.68） MPa，flexure load （146.05±5.92）、（151.23±7.79） N,which had significant difference with FRC posts adding no nanoparticles(P<0.05).Conclusions A small amount of nanoparticles can toughen FRC posts.