Shaped charge jet,one of three experimental methods to obtain hypervelocity impact,has been widely used on the warhead in various of weapons.When the metallic material is under hypervelocity impact,the plasma is produced.In this paper,the optimized structure of triple Langmuir probe is adapted to diagnose the plasma which is generated while the shaped charge jet is penetrating on metal target.By changing the angle and the material kinds of shaped charge liner,the velocity of the shaped charge jet reaches to 3800m/s、5100m/s、6800m/s、7200m/s,respectively.The relation between the velocity of shaped charge jet and the comprehensive characteristic parameters of electron temperature and electron density of the plasmas is acquired.Multiple measuring points are arranged,at the same time,the velocity characteristics of plasmas are analyzed.The damage of the weapon system can be assessed by establishing the relationship between different velocities of shaped charge jet,or different materials of the shaped charge liner,and the characteristic parameters of plasmas.