<p>The widespread use of low-heat Portland cement in hydraulic concrete highlights the significance of its sulfate-resistant quality in engineering. In this study, the porosity, sulfate ion concentration, compressive strength, Vickers hardness and linear expansion of low-heat cement paste were measured under the conditions of 0.5%, 5.0%, and 8.0% solution concentrations of Na₂SO₄ and 5.0% solution concentrations of MgSO₄, and (NH₄)₂SO₄. The phase composition and microstructure of the eroded cement pastes were measured using X-ray diffraction, thermogravimetric analysis, and scanning electronic microscopy. The results show that the linear expansion rate and compressive strength loss rate of cement paste increase with the increase of sulfate solution concentration. However, the relationship between sulfate solution concentration and sulfate ion penetration depth is not completely proportional. In the lower concentration of sulfate solution, sulfate ions show stronger ion transport ability in the cement slurry. After 360&#xa0;days of exposure to sulfates, the compressive strength loss rate of low heat cement in magnesium sulfate solution and ammonium sulfate solution was 3.1 times and 7.2 times that of sodium sulfate solution. The results indicate that, in sodium sulfate solution, the sulfate resistance of the specimens is strongest, followed by magnesium sulfate and ammonium sulfate.</p>