The compressive strength of calcium strontium sulphoaluminate cement with CaF2 added was tested. The influence of CaF2 on process of mineral formation and hydration of calcium strontium sulphoaluminate cement were studied by thermal analysis(DTA TG), X ray diffraction(XRD) and scanning electron microscopy(SEM). The results show that compressive strength of calcium strontium sulphoaluminate cement with 0.2%( by mass) of CaF2 added is optimal, the compressive strength for 3，28 d is 65.0，86.2 MPa respectively. CaF2 accelerates decomposition of CaCO3 and formation of C1.50Sr2.50A3 during sintering of clinker. Due to CaF2, hydration rate of cement is speeded up and CAH10 changes to C3AH6.