Abstract: The nano-sized oxide particles are evenly dispersed in oxide dispersion strengthened (ODS) alloy. This characteristic microstructure provides the materials excellent performance, making it become an important candidate for generation Ⅳ and fusion reactors, and thus are extensively investigated. Cr is a common alloy addition elements, it can combine with carbon to form carbides in steel, thereby improving the strength, melting point and stability of the material. The content of Cr will impact the microstructure of materials and change its mechanical properties. Therefore, the effect of Cr content on the tensile strength of ODS ferrite alloy was studied in this paper, by comparing the experimental results of its tensile strength, elongation, Vickers microhardness, etc. Aiming at different Cr content (12%Cr, 14%Cr, 16%Cr) ODS ferrite alloy samples, tensile tests were carried out at room temperature and 700 ℃. The SEM images of its tensile fracture were combined to explain the influence mechanism of Cr element on the tensile strength of ODS ferrite alloy. Experiment results show that ¹⁴Cr-ODS alloy has the highest tensile strength at room temperature or 700 ℃, but its toughness is very poor. The total elongation of ¹⁶Cr-ODS alloy increases at 700 ℃, the dimples in the sample are denser and smaller at high temperatures, and the number of inclusions or second-phase particles in the dimples reduces, so the strength of the material at high temperatures decreases significantly, but plasticity improves.