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In this article, PC mixed tree different fineness of calcium sulfoaluminate cement with the particle size (D50) was about 16.8μm, 10.7μm, 2.8μm.In order to study the impact of related physical properties and the effect of different fineness of calcium sulfoaluminate on cement hydration and microstructure of cement paste by means of X-ray diffraction(XRD), thermo gravimetric analysis(TGA).Results show that different fineness of CSA has little effect on the compressive strength of composite cement.The hydrates formed during the hydration process are similar in all the samples.The different fineness of CSA cement blends only slightly modifies the timing of formation of hydrates.