Abstract: To solve the NVH performance problems existing in the steering system during idling period of a car, a method combining simulation analysis with experimental test was applied to analyze the dynamic features of the steering system. A finite element model of the steering system was established and a simulation analysis on the model was undertaken. Through an objective vibration test and a modal test, the correctness of the finite element modal was verified. As to the idling resonance problem in the care, a size optimization on the steering system was conducted based on the finite element method. The optimized system was greatly improved in NVH performance and the requirement for the comfort of the vehicle was met. The results verify the feasibility of optimizing the vibration features of the steering system in the CAE simulation method.