This　paper　proposes　a　design　method　for　non-fragile　controller　via　μ　synthesis.　The　non-fragile　controller　is　such　that　the　closed-loop　system　is　stable　and　has　an　H∞　disturbance　attenuation　bound.　An　example　in　hydroelectric　generating　speed　system　is　provided　to　illustrate　the　design　procedure.