Abstract: The hot compression tests were carried out on hot extruded FGH95 alloy with 1050~1120 ℃ temperatures, 50% and 70% deformation, and 10⁻⁴~1 s⁻¹ strain rates. The microstructure evolution and nucleation mechanism of dynamic recrystallization (DRX) of this alloy were studied. The results show that increasing the deformation temperature and reducing the strain rate can promote the migration from low angle grain boundary to large angle grain boundary, which is beneficial to the growth of dynamically recrystallized grains. The influence of deformation temperatures and deformation on the dynamic recrystallization mechanism of hot extruded FGH95 alloy is not obvious, but the strain rate has a great influence on the dynamic recrystallization mechanism. With the increase of strain rate, the dynamic recrystallization mechanism of hot extruded FGH95 alloy gradually changes from discontinuous dynamic recrystallization mechanism to continuous dynamic recrystallization mechanism. The dynamic recrystallization mechanism of hot extruded FGH95 alloy is dominated by discontinuous dynamic recrystallization nucleation mechanism, supplemented by continuous dynamic recrystallization nucleation mechanism. Continuous dynamic recrystallization nucleation occurs at 1050 ℃, 1 s⁻¹ deformation conditions.