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This paper presents the optimization of bushing stiffness curves and suspension tuning parameters for enhancing the handling performance as well as the kinematic and compliance characteristics of the automotive suspension system. The optimization process consists of two steps. In the first step, the trailing arm bushing curves are optimized to satisfy the Kinematic and Compliance (K&C) characteristics of rear suspension. In this case, bushing stiffness curves are described as three parameters (linear gradient, non-linear gradient, transition position between linear range and non-linear range). The four optimization cases are executed to compare the design alternatives and choose the best one. In the second step, the handling performances are added to design requirements. In order to execute an automatic analysis process, K&C analysis and handling simulation are sequentially integrated using by Process Integration and Design Optimization (PIDO) technology.