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The principal aim of this work is to investigate the mechanical and thermal properties of graphene oxide reinforced epoxy composites. Surface modification was carried out by 3-aminopropyltriethoxysilane (APTS) with aqueous solution method. Surface modified graphene oxide was mixed in epoxy matrix by sonication process and composites were prepared by compression moulding technique. Three different formats: graphene (G), graphene oxide (GO) and APTS graphene oxide (APTS-GO) were incorporated respectively in an epoxy matrix to form composites. The tensile and impact tests show that the surface modified graphene oxide reinforced epoxy composites gives better results than unmodified graphene oxide reinforced epoxy composites. Scanning electron microscope images revealed that the dispersion of the surface modified graphene oxide on epoxy matrix was better at high frequency sonication than unmodified graphene oxide on epoxy system. The thermal properties of composites were analysed by Differential Scanning Calorimetry (DSC).