Abstract: MCM-41/ epoxy resin and modified MCM-41/ epoxy resin nanocomposites were prepared by solutionblending. The influences of coupling agent modification and the content of the particulates on the disperse propertiesand mechanical properties were investigated. The small angle X-ray diff raction ( XRD) of MCM-41/ epoxy resinshows that the nanO₂porous MCM-41 channels are not dest royed in the composite. Because modified MCM-41 canst rengthen the links between particle and mat rix , and modified MCM-41 particle can disperse evenly in the mat rix ,the tensile properties of the composite are the highest when the amount of the modified MCM-41 particle is 2.5 %(mass f raction) . Compared with the mat rix , the tensile st rength and the Young’s modulus of the composites are improved by 99.2 % and 110 % respectively.