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This research presents systematically an optimal design for the suspension based on LQG control to improve vehicle ride comfort and reduce manufacturing & using costs. The novelty lies in revealing that the optimized LQG control suspension is just a semi-active one. Based on quarter-vehicle model, investigation to the influences of suspension stiffness & basal damp on suspension performance and global damping characteristics of control force shows that the performance of LQG control active suspension is nothing to do with suspension stiffness & basal damp and the global damping characteristics of control force becomes obviously negative from obviously positive with basal damp increasing regardless of suspension stiffness. Suspension performance and manufacturing & using costs are considered comprehensively during optimizing the LQG control suspension. The optimization result shows that the optimized semi-active suspension based on LQG control has excellent comfort ride and low manufacturing & using costs.