Properties　of　ultra-high　performance　concrete　(UHPC)　which　used　ground　granite　powder　(GGP)　to　replace　cement　by　different　ratios　(from　0　to　25%)　are　experimentally　investigated.　The　hydration　products　and　pore　structure　on　the　micro　scale,　and　the　compressive　and　flexural　strength　as　well　as　chloride　permeability　on　the　macro　scale,　were　studied.　Influence　of　curing　conditions,　i.e.,　standard　curing　(SC),　warm　water　curing　(WWC),　and　autoclaved　curing　(AC),　was　also　explored.　It　was　found　that　though　the　replacement　of　cement　by　GGP　did　not　influence　the　morphology　and　chemical　compositions　of　hydration　products,　however,　the　pore　structure　changed　significantly　over　the　replacement　ratio,　i.e.,　ωGGP.　Compared　to　SC　and　WWC,　AC　can　significantly　improve　the　hydration　degree　of　cement　and　promote　the　polymerization　degree　of　hydration　products.　WWC　and　AC　also　improved　the　pore　structure　of　UHPC　prepared　with　GGP.　Compressive　and　flexural　strength　as　well　as　the　anti-permeability　were　found　to　first　increase　and　then　decrease　with　the　growth　of　ωGGP;　the　optimal　ωGGP　were　5%,　10%,　and　15%　for　UHPC　specimens　cured　under　SC,　WWC,　and　AC,　respectively.　It　was　also　found　that　the　compressive　and　flexural　strength　are　linearly　related　to　the　total　porosity,　while　the　chloride　permeability　is　linearly　related　to　the　contents　of　harmful　and　more-harmful　pores.　©　2019　Elsevier　Ltd