Abstract: Graphite oxide (GO) was prepared by using a modified layer of graphite powder as the raw material, and pseudoboehmite (AlOOH) nanoparticles were grown on the surface of GO by a sol-gel method to obtain pseudo-boehmite stone-coated graphene oxide (GO@AlOOH). The matrix (E51-BCE) was synthesized from epoxy resin (E51) and bisphenol A cyanate (BCE), and GO@AlOOH as reinforcement to prepare the GO@AlOOH modified epoxy resin-cyanate composites (GO@AlOOH/E51-BCE) composites. Infrared analysis and X-ray characterization of GO coating materials shows that AlOOH and GO particles have a particular interaction, and there are certain hydroxyl groups on the surface of the material after coating. The composite samples were characterized by SEM showing that the addition of GO@AlOOH significantly changes the fracture surface of the resin and improves the performance. When the doping amount is 0.6wt%, the bending strength, bending modulus and impact strength of the composite material reach the maximum, which are 158.23 MPa, 2.37 GPa and 46.96 kJ/m², respectively. The composite material has excellent mechanical properties and specific development potential.