Abstract: Q & P steel is a 3rd generation advanced high strength steel with high strength level and excellent plasticity.It has a wide range of applications in the lightweight of BIW.It is found that the QP980 has a better mechanical performance than the common high strength steel by single tensile and OM test.By using the analysis of load transfer path,the parts which are suitable for using QP980 can be chosen.The lightweight of the body is achieved through the optimization design of these parts.Use the FE analysis to obtain the frontal impact performance of the vehicle and verify the feasibility of the use of QP980 parts in the body and make the further verify through the real vehicle crash test.

Key words: body-in-white, lightweight, high-strength steel