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In vehicle crashworthiness simulation analysis, anti-crash performance of the front bumper beam assembly of auto body made of 22MnB5 by hot forming and high strength steel by cold forming is compared. Software PAM-CRASH is employed to analyze the energy absorption and the acceleration value of beams with different profiles and thicknesses during the frontal impact process. And the structure of the hot forming bumper beam is optimized to get more light-weight effect. The results show that the use of hot forming beam can not only improve the energy absorption, but also can effectively reduce the weight of the body in white.