Abstract: Thermal simulated test machine was adopted to carry out the hot compression test on CuNi30 Mn1 Fe under different compression temperatures of 800 ℃, 850 ℃, 900 ℃, 950 ℃ and 1 000 ℃ respectively and different deformation rates of 10 s^-1, 1 s^-1, 0.1 s^-1 and 0.01 s^-1. Based on the work-hardening rates of materials, dynamic recrystallization(DRX) behavior of CuNi30 Mn1 Fe was analyzed and the the critical strain of DRX was obtained. The results showed that dynamic recovery and dynamic recrystallization occured during the compression test, that the critical strain of DRX decreased with the increasing of temperature and increased with the increasing of strain rate and that the critical strain ε_c and the peak strain ε_p had the relation of ε_c=-1.03ε_p+1.36.