Abstract: Damage and fractures in deep rock masses of gold mines significantly affect their mechanical behavior. Under the action of dynamic load in particular, fracture propagation may induce rock mass instability and engineering hazards. The discrete element software PFC was adopted to numerically simulate the dynamic failure process of gold mine rock specimens containing prefabricated fractures under impact load, with a focus on studying the effects of different strain rates and fracture geometric characteristics （such as the inclination angle） on the dynamic mechanical behavior of rock. The results demonstrate that the increase in the strain rate markedly improves the dynamic yield strength of rock but has a negligible influence on the elastic modulus. Fractures significantly degrade the dynamic compressive strength of rock, and the dynamic peak strength of prefabricated fracture specimens is considerably lower than that of intact specimens, which exhibits the trend of first decreasing and then increasing with the fracture inclination angle and reaches a minimum at the inclination angle of 45°. Under impact load, parallel double fractures exert a banded influence on the specimens, and their effect on the rock bridge region intensifies as the inclination angle increases. The results can provide a theoretical basis for disaster prevention and control in deep mining operations of gold mines.