Recycled　aggregate　concrete　RAC　was　modified　by　adding　nanoSiO2　nanosilica　sol　and　nanoSiO2　powderand　nanoCaCO3　powder　to　study　the　fracture　performance.　The　fracture　property　of　RAC　modified　by　nanomaterials　was　tested　by　threepoint　bending　beam　method　and　traditional　electrical　measurement.　The　results　show　that　the　28　d　compressive　strength　and　splitting　tensile　strength　of　RAC　can　be　effectively　improved　by　adding　proper　amount　of　nanoSiO2　and　nanoCaCO3.　Adding　1.0%　nanosilica　sol0.5%　nanoSiO2　powder　and　2.0%　nanoCaCO3　powder　respectively　has　the　most　effective　on　the　improvement　of　doubleK　fracture　parameters　and　fracture　energy.　After　the　addition　of　nanomaterials　more　cracks　pass　through　the　recycled　aggregate　than　that　for　ordinary　concrete　nanomaterials　promote　production　of　higher　density　hydrate　and　reduction　of　the　number　of　internal　pore　in　interface　transition　zone.　©　2022　Tongji　University.　All　rights　reserved.