In　this　paper,　ground　calcium　carbonate　(GCC)　was　selected　to　improve　the　properties　of　epoxy　resin　mortar　(ERM).　The　results　indicated　that　the　flexural　strength　and　ratio　of　flexural　strength　to　compressive　strength　of　ERM　got　great　increase　by　incorporation　of　GCC.　At　the　same　time,　the　impact　toughness　of　ERM　had　greatly　improved　with　GCC.　To　some　extent,　it　increased　with　increasing　addition　of　GCC.　Scanning　electron　microscope　(SEM)　analysis　illustrated　the　toughening　mechanism　of　ERM　filled　with　GCC.　Through　orthogonal　experiment,　the　optimal　combinations　of　the　process　parameters　for　a　high-performance　repair　mortar　are　obtained.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.