In order to reveal the influence law of graphite ore grade on its dynamic mechanical properties,SHPB tests were carried out on graphite ore samples with five grades of 1.57%,5.19%,10.79%,12.65% and 19.50% under the action of constant amplitude impact loads.Based on the analysis of microscopic fabric characteristics of the graphite ore,the peak strength(σd),dynamic elastic modulus(Ed),peak strain(εd) and energy consumption density(ASE) of the samples were analyzed.The results show that the change of the dynamic mechanical properties of the graphite ores with different grades is the result of the change of mineral composition and graphite flake distribution characteristics.With the increase of graphite ore grade,the dynamic mechanical properties of the sample are obviously weakened,but there is a limit of the weakening degree.The σd,Ed,and ASE have a good negative exponential function fitting relationship with graphite grade(correlation coefficients R2 is 0.977,0.930 and 0.973,respectively).With the increase of graphite ore grade,the σd,Ed,and ASE decrease gradually in a gentle trend and eventually reach a stable value.However,with the increase of graphite ore grade,the εd increases approximately linearly at the initial stage.When the grade reaches 12.65%,the εd increases significantly,and then decreases slowly,but the decrease degree of εd is very small.On the whole,it still shows a good increasing law of weak power function(R2 is 0.810) for εd with the increase of graphite ore grade,indicating that the general weakening trend of the dynamic mechanical properties of the samples with the increase of graphite ore grade has not changed.