Abstract: A research on the application technology with high performance bullet proof material was carried out for police cars. Firstly, a graphene modified method was used to improve the strength and elasticity of ceramic and aluminum alloy. Then, a composite bulletproof armor was prepared with graphene modified material. Finally, a target practice test was implemented to validate the feasibility of the graphene modified method. The results show that, graphene modified method can improve the toughness of ceramic material and the strength and elasticity module of aluminum alloy. The composite armor made by graphene modified material can against 3 times of 7.62 mm API piercing incendiary.