| With the rapid increase of the population of vehicles, traffic accidents have already become a great public hazards in the global range. How to guarantee the passenger's security and improve car's passive security greatly, which have already become a great theme in our times. The essential condition of the further collision research is offered with the improving of computing power and the development of the simulation technology. Software MADYMO is adopted to evaluate and optimie the restraint performance in many foreign automotive corporations at present. MADYMO is used to modelling and optimize in the paper.First, the research and the developing status quo of occupants'restraint system, as well as the characteristic of occupant's injury and restraint system's appraisal and criterion are illustrated. Then the software developed by Holand TNO is assimilated, The multibody theory of MADYMO software was dissected, and the general process of modeling by software MADYMO and studying the occupants'restraint system are also gripped.The simulation analysis of the completed model was carried out by using software MADYMO and the visual results was also realied with Hyperxies. The simulation results was verified to be corrected through car experiment which according to the regulation at 48km/h. The tested Hic3\chest C3m\the chest deformation of dummy is compared with the simulation injure value to verify the accuracy of the simulation model.Finally, the sensitive parameters of the model were obtained using software modelFronTier and the optimized parameters have been gotten,which makes the model has a good performance characteris.
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