Abstract: Under the combined action of deep high stress and blasting load，the damage of deep rock mass will be a complicated dynamic evolution process.In order to study the mechanism and influencing factors of deep rock blasting damage，the effects of different explosive peak stress，loading rate and static stress on the size of blasting damage were studied by FLAC3D nonlinear dynamic analysis method.The propagation rule of blasting damage zone with dynamic loading time is discussed，and the size of damage area after blasting is analyzed and evaluated in qualitative and quantitative way.The results show that the different peak stress mainly affects the damage area and the damage amount of the rock mass in the rising stage of the stress wave.The different loading rate mainly affects the development speed of the damage area，and different static stresses mainly affect the final form of the tensile failure zone and tensile damage.The study provides some reference for the design of deep rock blasting excavation.

Key words: Deep rock mass, Blasting damage, Numerical simulation, Damage law, Rock damage