Aimed at the influence laws and mechanism of the nose shapes of the rod penetrators on penetrating performance,the research on rod penetrators with different nose shape vertical penetrating was carried on.The results show that for the 4340 steel target,the nose shape of the penetrator has some influence on penetration depth if the incident velocity is rather small,but the optimal shape is semi-spherical rather than ogival or flat,however,if the incident velocity is big enough,the effect of nose shape on pen...