The mechanical properties, hydration products, and pore structure of SSC(super sulphated cement) were tested with universal test machine，XRD(X-ray diffraction), SEM(scanning electron microscope) and MIP(mercury intrusion porosimetry), which were compared with P·O 42.5 and slag cement. Results show that the main hydration products of SSC are ettringite, C-S-H gel and little gypsum crystals, while without calcium hydroxide; SSC hardened paste has smaller threshold pore diameter, the most probable pore diameter, middle pore diameter and average pore diameter, and has lower porosity and higher density, which can effectively promote the 90-day strength increase of SSC paste.