Abstract: To improve the collision performance of traditional vehicles,a new vehicle collision absorber is proposed and optimized in this study.On the basis of Bingham-plastic nonlinear flow modified（BPM） model,a weighting objective function of the response time,the maximum damping force and the damping dynamic range is formulated to avoid the design limitation under the high impact condition.A genetic algorithm is applied to find the optimal solution.The optimal results show that the magnetic circuit of the optimal MR absorber is more reasonable and the response time is much shorter.