Abstract: The dynamic mechanics properties of 3D four directional braided carbon fiber reinforced resin matrix composites were investigated using split Hopkinson pressure bar(SHPB). Conducting experiments on specimens of different braid angles in longitudinal, transverse and thickness directions, the stress-strain curves of the composites were obtained at strain rate ranging from 800/s to 2 000/s, and the quasi-static compression test results were also included. The influence of strain rate, compressive direction and braid angle on ultimate strength and elastic modulus was discussed. And the processes of experiments were recorded by high-speed camera, thus the effect of strain rate and compressive direction on the failure mode can be further analyzed. The results show that the 3D four directional braided composite is sensitive to strain rate in all three compressive directions, with ultimate strength and elastic modulus both increasing as strain rate rises, and it becomes more fragile in high strain rate compared with quasi-static conditions. The braid angle has influence on dynamic compressive properties, which is the most when it comes to the longitudinal direction. The failure mode of the composite changes in different compressive directions and strain rates.