This article studied the influence of desulphurization gypsum powder on the performances of cement-based binding materials. The results indicated that the soundness of the desulphurization gypsum and cement binding materials is good; the later setting time of that lengthens very much; the earlier setting time and water consumption for standard consistency of that add a little. When the micellae of desulphurization gypsum and cement hydrates, a part of desulphurization gypsum reacts with cement and produces ettringite crystal, and a part of that fills in the as the micro-aggregate. Numberless X-smallspheres desulphurization gypsum disperses uniformly in the slurry; and fills in and thinings the pores and holes; and improves the structure of the hole in; and raises the compactness of the micellae. The XRD patterns of variant age pastes samples indicate that the hydration products of composite using desulphurization gypsum and cement are mainly tohermorite, ettringite and dihydrate gypsum.