Abstract: Compression (with 10%-50% deformation), tension (with 10%-40% deformation) and bending (with 20°-180° bending angle) deformation tests at room temperature were conducted on SP2215 heat resistant austenitic steel. The microstructure, microhardness and strength of the steel after room temperature deformation were studied. The results show that no martensitic transformation occurred in SP2215 steel during room temperature deformation. The steel had high austenite structure stability. Dislocation slips always took part in deformation. Room temperature deformation could greatly improve the work hardening of SP2215 steel, thereby increasing the tensile strength and hardness, and doubling the yield strength.