A new type of ultra-high performance concrete with superfine cement called SC-RPC was prepared. The compressive property of SC-RPC under different curing conditions was tested, and the pore structure of its mortar was studied by mercury porosimetry. The test results show that the compressive strength of SC-RPC cured in high temperature is much higher than in room temperature; the SC-RPC mortar’s total pore volume below 50 nm is smaller, the corresponding compressive strength of SC-RPC is higher; the discrepancy of the total pore volume of SC-RPC mortars may be caused by the impact force generated in the sample preparation process; the total surface area of SC-RPC mortar in high temperature is obviously lower than in room temperature.