Alitestrontium calcium sulphoaluminate cement(ASCSC), a new type of cementitious material was synthesized by combining strontium calcium sulphoaluminate with minerals of Portland cement. The influence of excessive SO3 and SrO on the performances of this cement was studied by XRD, SEMEDS, and lithofacies. The results show that the optimal excessive mass fraction of SO3 and SrO are 50% and 80%(by mass). The compressive strength of the cement prepared under these conditions reaches 32.8, 66.8, 126.4MPa at 1,3,28d. The additions of SO3 and SrO are beneficial to increase of content of strontium calcium sulphoaluminate and promotion of the formation of alite at low temperature.