The monodisperse mesoporous SBA-15 (MSBA-15) was synthesized by static method and carried on coupling treatment, and then melt-blended with epoxy resin, followed by cast molding and post-cure process to obtain monodisperse mesoporous SBA-15/epoxy composites (MSBA-15/EP). FT-IR, XRD, SEM and N₂ adsorption were used to characterize MSBA-15 before and after coupling treatment, and the mechanical and dynamic mechanical properties of the composite were measured. The results show that MSBA-15 has good monodispersity and mesoporous structure, and coupling treatment has little effect on mesoporous structure of MSBA-15. Coupling treated MSBA-15 has good dispersibility in epoxy resin matrix, compared with pure epoxy resin, and when the mass fraction of MSBA-15 is 5% of MSBA-15/EP composite, the tensile strength, glass transition temperature (Tg) and initial storage modulus of MSBA-15/EP composite are increased by 28%, 7 ℃ and 9.4%, respectively. Meanwhile, the analysis of cross section of MSBA-15/EP composites show that the compatibility between two phases is excellent, and cross section is ductile fracture in composites.