Deterioration of Concrete in Sulfate Environment. Based on the corrosion mechanism, this paper adopts Fick's second law, considers the tortuosity of sulfate ion diffusion in concrete, and combines the effects of cement hydration, corrosion product filling and material damage function on pores to establish the diffusion of sulfate eroded concrete- reaction model. Soaking corrosion tests of concrete with three water-cement ratios under two concentration of sulfate attack were carried out and compared with model calculation results. The results show that the calculated value of the model is basically consistent with the measured value of the test. At the same concentration, the higher the water-cement ratio, the higher the content of sulfate ions in the same section of concrete. The higher the erosion concentration, the shorter the filling period of corrosion products and the greater the erosion depth in the same period. Finally, the maximum depth of concrete eroded by sulfate ions is predicted. It is found that the maximum erosion depth of concrete corroded by sulfate gradually slows down with the prolongation of corrosion age. Then, with the loss of corrosion products to concrete, the diffusion rate increases and the erosion depth increases.