Abstract: In the field of high-temperature dust removal, 316 L alloy fiber fabric has attracted widespread attention due to its reusability. However, the gas-solid corrosion characteristics and mechanism of 316 L alloy fiber materials are not clear, which has become a risk factor in practical applications. Based on the gas-solid corrosion characteristics of 316 L alloy fiber fabric, a fixed bed simulation corrosion experiment was used to study the corrosion behavior of 316 L alloy filter materials under SO_2 atmosphere, and analyze the filter performance and mechanical properties of the filter after corrosion. The influence of SO_2 concentration and flue gas components(O_2,H_2O) on its corrosion characteristics was studied. And the microscopic morphology and element distribution of the filter material before and after corrosion were combined to study the corrosion mechanism. The results show that the overall corrosion degree of the 316 L alloy fiber filter material is low, and the maximum corrosion gain rate during the corrosion cycle is 2.30 mg/g, which is mainly reflected in local corrosion. The enrichment of Mn and S elements is observed in the surface pits and the local content is 21.28% and 13.08%. The change of SO_2 concentration has a weak influence on the corrosion reaction, and the influence of O_2 on the corrosion process is mainly reflected in the oxidation reaction at the initial stage of corrosion, which has little promotion of the overall corrosion process. H_2O has a significant inhibitory effect on the corrosion reaction. The air permeability and pore structure stability of the filter material remain good after corrosion, the porosity decreases by less than 5%,while the flexural ratio of the material is significantly improved and vibration resistance is significantly reduced.