Abstract: To solve the problem of insufficient penetration depth of traditional polymer-based reactive liner shaped charge,a novel reactive material-copper liner shaped charge was designed. The jet formation and penetration enhancement behavior of the reactive material-copper jet against steel target were studied through combining simulations and experiments. Numerical simulations indicate that the inner copper liner mainly forms a high-velocity precursor jet to firstly penetrate the steel target,and the outer reactive liner becomes a major part of the slug,which can follow the copper jet into the penetration hole. Experimental results show that,compared with the traditional single reactive jet,this reactive material-copper jet produces a deeper penetration depth,and its penetration performance and reactive material mass entering the penetration hole are strongly influenced by the standoff. Further comparison analysis demonstrates that the deflagration reaction of reactive materials will lead to an early termination of the penetration process,and the likely mechanism is that reactive materials' chemical reaction would cause the serious instability of copper jet,eventually resulting in the residual jet not being able to continue penetration.