To minimize thorax-abdomen injuries in side impact and to make sure that HIC meet C-NCAP requirements,an optimization design of head-thorax airbag was conducted by using the validated FE models,the stepwise regression surrogate model and successive optimization method.An L-shape head-thorax airbag model was established and installed on a validated vehicle FE model.The response process of the airbag in side impact was simulated in combination with driver model.The airbag design parameters were analyzed and o...