Abstract: The effects of electromagnetic shock treatment on the impact toughness and the microstructure of TC11 titanium alloy were studied by Charpy impact test,metallographic microscope,scanning electron microscope and transmission electron microscope. The effect of treatment time on the impact toughness of TC11 titanium alloy during electromagnetic shock treatment was analyzed and discussed. The results show that compared with that of the untreated samples,the impact energy of the samples increase by 13.2%,20.3% and 3.1%,respectively after the electromagnetic shock treatment with the treatment time of 0.44 s,0.88 s and 1.32 s.With the extension of treatment time,α phase content of TC11 titanium alloy keeps rising.The increase of α phase is not conducive to the improvement of impact toughness of TC11 titanium alloy,the interface wetting and interface bridging caused by electromagnetic impact treatment play a decisive role in the improvement of impact energy of the sample.