In order to study the dynamic mechanical response of biotite granite，the dynamic compression and tensile tests to biotite granite sample are implemented by the SHPB experimental device system. The dynamic compression and tensile mechanical properties are investigated. Experimental results indicate that the dynamic compressive strength increases with impact speed increasing, and reaches to 347.1 MPa when impact speed arrives at 15.0 m/s.The dynamic compressive fracture form changes from mass to powder failure when the impact speed increases. Compared with static tensile strength, the dynamic tensile strength increases significantly.