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In this article, Alite-yeelimite cement clinker was through the portland cement clinker by SO2.The qualitative analysis of the phase composition was performed by X-ray powder diffraction analysis (XRD).The experiment of isothermal calorimetry was used to analysis the hydration performance of Alite-yeelimite cement.Results showed that when the temperature reached 1000℃ the compositions of Portland cement clinker changes.With the increase of temperature C4A3$, CaSO4 and C5S2$ were generated.C5S2$ has been identified by many investigators as an inert hydrating phase.When the temperature up to 1250℃, C5S2$ basically decomposition.As the existence of C4A3$, the heat release of Alite-yeelimite cement was higher than Portland cement at the initial period of hydration.