Abstract: The dry-wet cycle method is adopted to study sulfate resistance of standard cubic plain concrete and hybrid fiber concrete specimens (150mm×150mm×150mm). The anti-sulfate corrosion performance is tested at the erosion age of 0， 30， 60， 90， 180， 210 days with sodium sulfate erosion solution concentrations of 800 and 6000mg/L. The results show that when the erosion age is 210 days， corresponding to concentrations of 800 and 6000mg/L， compressive strength of plain concrete decreases by 5.6% and 10.0% and splitting tensile strength decreases by 3.0% and 5.1% respectively. Compressive strength of hybrid fiber concrete decreases by 4.0% and 6.3% and splitting tensile strength decreases by 0.51% and 3.8% respectively. When erosion depth comes to 1.5mm， SO^2-₄ concentrations of plain concrete are 0.83% and 1.03%， while hybrid fiber concrete are 0.79% and 1.0% respectively.

Key words: hybrid fiber concrete, dry-wet cycle, sulfate, compressive strength, splitting tensile strength, SO^2-₄ concentration