The influence of P2O5 on the properties of alite-calcium strontium sulphoaluminate cement was researched by means of X-ray diffraction, scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) and petrographic analysis. The results show that the optimal content of P2O5 is 0.3% and the compressive strength of the cement at 1, 3, 28d are 27.0, 59.1, 110.9MPa when the calcining temperature is 1350°C. P2O5 mainly exists in the belite and a suitable amount of P2O5 can promote the formation of C1.5Sr2.5A3 and alite. When the content of P2O5 is higher than 0.3%, the formation of C1.5Sr2.5A3 and alite can be hindered. P2O5 can enhance the hydration heat evolution rate in the acceleration period and the hydrate heat of cement containing P2O5 increases slightly.