The high temperature tensile and compressing plasticity of austenite stainless steel 15Mn-22Cr-0.56N and effect of hot rolling process on structure and mechanical properties of steel have been studied by thermal simulated test and single pass 20%~60% deformation hot rolling test. Simulated steel results showed that the optimum hot plasticity zone was 1000~1150 ℃;and the hot rolling test results showed that the optimum rolling parameters of steel 15Mn-22Cr-0.56N was 40% deformation at 1000~1050 ℃ by which the steel could get higher strength and toughness.