Abstract: By 5%(（NH₄)）₂SO₄ solution soak the mortar test block of exterior surface observation, strength test, weight loss and try to analyze the corrosion mechanism, Mineral admixture is studied in single doped with double mixing effect on the properties of ammonium sulfate erosion resistance of the cement mortar. And using the gray correlation analysis method and the effect of dosage on the compressive strength of the relationship. The research results show that:Double mixing, the micro aggregate effect and morphological effect of the fly ash was better than that of slag, and the two have complementary effect on job performance, The incorporation of mineral admixtures can improve the corrosion resistance of cement mortar with ammonium sulfate, has obvious inhibitory effect on the prevention and; Ammonium sulfate erosion resistance effect of different mineral admixture by superior to inferior order in turn: