The flow behavior and processing maps of homogenized AA7085 aluminum alloy were investigated by isothermal hot compression tests in the temperature range of 300-450?C and strain rate range of 0.01-10 s-1. Microstructure was characterized using Optical microscopy (OM), electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM). The results show that the superimposed processing maps at different strains exhibit the optimized deformation parameters with the temperature range of 390-450 ?C and strain rate of lower than 0.1s-1. Microstructure characterization reveals that dynamic recovery and recrystallization are the main deformation mechanisms in the safe regions.In the low temperature and low strain rate regions, the coarsening of particles between ε=0.5 and ε=0.7 may be responsible for the transformation from unstability to safe domain.