The　effect　of　replacing　part　of　ordinary　Portland　cement　by　granite　powder　on　the　electric　flux,　pore　structure,　compressive　and　flexural　strength　of　UHPC　under　autoclaved　curing　was　investigated.　The　results　show　that　when　part　of　ordinary　Portland　cement　is　replaced　by　granite　powder　from　0%　to　15%,　the　electric　flux,　average　pore　size　and　the　total　pore　volume　decrease,　and　the　compressive　strength　and　flexural　strength　of　7　days　and　14　days　improve;　when　part　of　ordinary　Portland　cement　is　replaced　by　granite　powder　from　15%　to　20%,　the　electric　flux,　average　pore　size　and　the　total　pore　volume　increase,　the　compressive　strength　and　flexural　strength　decrease.　When　15%　of　ordinary　Portland　cement　is　replaced　by　granite　powder,　the　pore　structure　of　UHPC　is　the　best　and　its　compressive　strength　and　flexural　strength　are　the　highest.