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The paper studied the influence law of soluble-phosphorus、 eutectic-phosphorus and soluble-fluorine to the physical properties of over-sulphur-phosphorous-gypsum-slag cement paste (OPSC).That cement was modified by adding steel-slag-powder, and the paper also discussed the mechanism.The result showed that the content of soluble-phosphorus、 eutectic-phosphorus and soluble-fluorine affected the setting time and mortar strength remarkably.If phosphorous gypsum(PG) was pretreated by steel-slag powder, the setting time became shorter and the early age strength became higher.As a result, it is the effective way to prepare the high quality OPSC that descreasing the content of soluble-phosphorus、 eutectic-phosphorus and soluble-fluorine, and pretreated by steel-slag-powder.