Leaf spring multibody dynamics model was established by using discrete BEAM methodsim plified equivalent neutral surface,the results of simulation analysis of the model were comparedwith the experimental results.The modeling parameters of the leaf spring assembly characteristics onvehicle performance were analyzed by implanting the model to suspension system arid vehicle model.The results indicate that the discrete BEAM method to establish the leaf spring model is able to simu-late the actual characteristic of leaf spring.The vehicle with oversteer or excessive understeer charac-teristics can obtain the desired understeer degree by lowering or raising the eyehook position.