Abstract: Medium manganese steel, as a typical representative of the third-generation advanced high-strength steels, has excellent mechanical properties of high strength and toughness. Due to the transformation-induced plasticity (TRIP) effect, its deformation mechanism is more complex compared to other steels. To ensure the safety of service components, the deformation characteristics and mechanisms of medium manganese TRIP steel under high temperature and cyclic loading are urgently needed to study. The uniaxial cyclic experiments of Fe-0.35C-7Mn-3.2Al steel were conducted at temperatures of 200 ℃ and 300 ℃ respectively, and the X-ray diffraction (XRD) was used to measure the volume fraction of retained austenite (RA), revealing changes in RA content at different temperatures. The experimental results show that, at 200 ℃, the material's cyclic softening/hardening characteristics are similar to those at room temperature, essentially showing cyclic stability; while at 300 ℃, it exhibits significant cyclic hardening. The ratcheting behavior of the material under asymmetric stressing also displays different characteristics. At 200 ℃, it is similar to that at room temperature, where the ratcheting strain continues to increase without saturation during cycling, but at 300 ℃, the ratcheting strain quickly reaches saturation and no longer increases. During the cyclic deformation process at 200 ℃, significant martensitic phase transformation occurs, while at 300 ℃, the martensitic transformation is almost absent. It provides a reference and basis for the subsequent study on the temperature-related mechanical properties of medium manganese steel.