The hot deformation behavior of Incoloy 825 alloy under 60% deformation,950 ~ 1150 ℃ temperature and 0.001 ~ 1s-1 strain rate was studied by hot compression test. Based on Arrhenius equation and Zener Hollomen parameter model, the constitutive equation model of the alloy was established. The microstructure evolution of the alloy was studied by means of metallographic microscope (OM) and electron backscattering diffraction (EBSD). The results show that the percentage of DRX increases with the increase of deformation temperature or the decrease of strain rate. DRX includes both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) during hot deformation. With the increase of deformation temperature or the decrease of strain rate DDRX increases and CDRX decreases. In addition, with the increase of temperature or the decrease of strain rate, the low angle grain boundary gradually transforms to the high angle grain boundary. Simultaneous random distribution Σ3 twin boundaries tend to homogenize, It also promotes the dynamic recrystallization.