Abstract: Experiments were performed to investigate the magnetically accelerating flyers using fast pulsed power. Two flyers with different thicknesses were launched simultaneously, and their velocity histories were recorded by VISAR. When the maximum current density was 823 kA/cm, the flyer 0.38 mm in thickness and 4 mm in diameter could be accelerated to the velocity of 1.5 km/s in 2 s, and its maximum magnetic loading pressure was 4.25 GPa. It was observed from the metallographs that when flyer velocity was high, there was amorphous body on the shear fracture zone at the bottom of the counterbore left by the flyer due to large degree of supercooling in freezing. This work will be helpful to further development of isentropic compression technique and the study of equation of state.