The hot deformation behavior of TiNiFe shape memory alloy was studied by isothermal compression tests.It was performed on a Gleeble-3500 thermal simulation machine at deformation temperature of 750 to 1050 ℃ and strain rate of 0.01 to 10.00 s~(-1) with maximum strain of 0.8.Deformation mechanism was investigated by the aid of true stress-true strain curves,kinetic analysis and processing map.The constitutive relationship was established in the form of Arrhenius-type hyperbolic-sine equation,and the apparent activation energy was calculated to be approximately 200 kJ·mol~(-1).The processing maps of TiNiFe alloy were appreciably influenced by true strain. The hot deformation behavior of TiNiFe shape memory alloy was studied by isothermal compression tests. It was performed on a Gleeble-3500 thermal simulation machine at deformation temperature of 750 to 1050 ° C and strain rate of 0.01 to 10.00 s ~ (-1) with maximum strain of 0.8. Deformation mechanism was investigated by the aid of true stress-true strain curves, kinetic analysis and processing map. The constitutive relationship was established in the form of Arrhenius-type hyperbolic-sine equation, and the apparent activation energy was calculated to the processing maps of TiNiFe alloy were appreciably influenced by true strain.