Abstract: Oscilloscopic impact properties of 16MnR steel plates treated by single-side or double-side explosion shock waves were studied and compared with untreated ones.Single-side explosion treatment could improve the total impact energy (Et),especially,crack initiation energy (Ei) of 16MnR steel at 0-20 ℃ and crack growth energy (Ep) at -20 to-40 ℃,but has little effect on the ratio of Ep/Et.The double-side explosion treatment decrease all kinds of impact energy.These phenomena have been proved by the characteristics from SEM fractographs.