In　this　paper,　we　investigate　the　instability　for　Rayleigh-Taylor　problem　of　three-dimensional　incompressible　non-Newtonian　fluids　with　Eills-type.　If　the　density　profile　in　equilibrium-state　is　heavier　with　increasing　height,　we　prove　that　the　equilibrium-state　solution　is　unstable　under　H3$$　{H}＜^＞3　$$-norm　by　exploiting　a　bootstrap　method.