In order to improve the performance of homogeneous armor resist the shaped charge jet, put forward a new type of the aqueous medium armor’s structure. Through the LS-DYNA software simulate the process of shaped charge jet penetrate the aqueous medium armor, comparative analysis the protection performance of homogeneous armor and aqueous medium armor, and optimized the thickness of forward armor. The results show that: the aqueous medium armored relatively homogeneous armor can greatly enhanced armor protection performance, through optimal designing preposition armor thickness to further improve protection performance to shaped charge jet.