A　multi　-objective　parametric　design　method　is　developed　for　an　equivalent　-input　-disturbancebased　control　system　with　mismatched　disturbances.　Different　from　the　existing　design　methods　that　calculated　control　parameters　by　stability　conditions,　multiple　performance　objectives　including　unmeasurable　output　estimation,　disturbance　rejection,　noise　suppression,　input　refinement,　and　robustness,　are　simultaneously　optimized　in　the　developed　design.　First,　for　the　sake　of　low　computation　complexity,　the　closed　-loop　system　is　represented.　Then,　the　parameterization　of　the　design　conditions　for　multiple　performance　objectives　is　given.　Further,　a　nonlinear　optimization　method　is　used　to　perform　the　performance　-oriented　system　design.　Lastly,　the　efficacy　and　benefits　of　the　developed　methods　are　demonstrated　through　simulations　of　a　quarter　-vehicle　suspension　system　and　comparisons　with　other　alternative　methods.