This　paper　considers　robust　H∞　state　feedback　control　problem　for　systems　with　parameter　uncertainty　and　external　disturbance.　The　solution　to　the　problem　only　involves　one　algebraic　Riccati　equation,　and　according　to　the　algebraic　Riccati　equation,　the　state　feedback　matrix　can　be　obtained,　the　structure　of　which　maintains　the　same　form　as　LQ　optimal　design.　Such　state　feedback　control　can　ensure　that　the　closed-loop　system　with　parameter　uncertainty　is　stable　and　achieve　optimal　H∞　disturbance　attenuation.