Influences of curing temperature on the early microstructure evolution of calcium sulfoaluminate cement Portland cement anhydrite ternary blends were recorded by X ray diffraction(XRD), scanning electronic microscopy(SEM) and mercury intrusion porosimetry(MIP). The related phase composition, microstructure of fracture surface and pore structure were systematically investigated. Results reveal that, cured at 10, 20℃ or 40℃ respectively, the main hydration products are firmly related to calcium sulfoaluminate based phases. Additionally, higher temperature not only results in a faster consumption of yeelimete and a more rapid formation of ettringite and earlier formation of plate like monosulfate, but also leads to coarser of critical pore size and thus lower compressive strength.