The hydration behavior of calcium sulphoaluminate cement blended with silica fume were investigated through the compressive strength test, setting time test, electrical resistivity test, X ray diffraction(XRD), scanning electron microscope(SEM) and pore solution analysis. The results show that addition of mass fraction of 5% of silica fume increases the compressive strength of cement pastes, while addition of mass fraction of 10% of silica fume results in a higher compressive strength than that of the control sample after 1d and 28d. The setting time of calcium sulphoaluminate cement blended with silica fume is shortened. The XRD results show that the main crystal product of calcium sulphoaluminate cement is ettringite, and content of ettringite after 28d is slightly higher than that after 3d. The electrical resistivity of calcium sulphoaluminate cement blended with silica fume is higher than that of the control sample, which indicate that the hydration of calcium sulphoaluminate cement is promoted. The alkalinity of pore solution of sulphoaluminate cement pastes is decreasing with the increase of silica fume. Change of concentration of Ca2+ in the pore solution indicates that the silica fume promotes the dissolution of sulphoaluminate cement clinkers. From the lowest concentration of Al3+ it is shown that the mass fraction of 5% of silica fume promotes the hydration more obviously.