Abstract: The hot deformation behavior of Fe-13 Cr-4 Al alloy was investigated by compression test on a Gleeble-1500 thermal simulator under the temperatures of 800～1 000 ℃ with strain rates of 0.01～10 s^-1.Based on experimental data,the true stress-strain curves of Fe-13 Cr-4 Al alloy were drawn,which showed that dynamic recrystallization occurred at the low strain rates(0.01～0.1 s^-1) and dynamic recovery occurred at the high strain rates(1～10 s^-1).According to the dynamic material model dissipative structure theory,the processing maps of Fe-13 Cr-4 Al were established at different true strains.The effect of strain on power dissipation rate was complicated.The peak power dissipation rate occurred at the temperature of 1 000 ℃ and strain rate of 0.01 s^-1,and it increased with increasing strain.It could be seen from the processing map the optimum hot deforming domain was determined to be temperature of 800～850 ℃,strain rate of 0.01-1 s^-1;temperature of 900～1 000 ℃,strain rate of 0.01-0.0.02 s^-1 and temperature of 900～1 000 ℃,strain rate of 0.5～10 s^-1.