<p>In order to study the relationship between rock mass dynamic parameters and blasting parameters, a calculation model of graphite ore bench blasting powder factor considering rock dynamic fragmentation energy consumption density is established based on dimensional analysis method. The dynamic compression tests of five types graphite ores with different grades under different impact pressure were designed and carried out with split Hopkinson pressure bar (SHPB) test system, combining with crushing screening tests, the reasonable range of strain rate and energy consumption density were obtained when the specimens were crushed. Through the field blasting test of Yunshan graphite mine in Luobei County, China, the reasonable powder factor of ore rock with different grades were explored. It is found that there is a Boltzmann-function relationship between the reasonable powder factor and 1/2 power of reasonable energy consumption density of ore rock dynamic fragmentation, and the calculation formula of powder factor is established accordingly. In practical mine production blasting, the powder factor values calculated with this formula highly satisfy the demands of the mine rock blasting, which verified the rationality and reliability of the functional relationship between the powder factor and energy consumption density.</p>