【Objective】Aiming at evaluating whether the structural performance of a passenger-vehicle front suspension lower control arm could meet the design requirements.【Method】Firstly, the lower control arm grid model was established based on finite element technique, the modal analysis results showed that its first three modal formations were obtained. Secondly, the force and moment of the lower control arm were extracted based on front suspension dynamic model, the lower control arm was strength analyzed by adopting inertia release method, its stress were obtained. Lastly, the thickness of lower control arm was parameters optimized, so the optimal structural parameters were obtained.【Result】Its first three modal formations were outside the external excitation frequency range, so it could meet vibration characteristics requirements. Its stress were lower than the material yield value, so it could meet the strength performance requirements. The structural performance of lower control arm could meet the design standards after optimization, its weight had been reduced by 12.5%.【Conclusion】The analysis method could provide effective reference and reference for the design and optimization of the similar product, it had very important practical engineering significance.