[en] We investigate properties of magnetic superconductivity as a mechanism for quark confinement. There are two kinds of magnetic permeability, m/sup ele/ and m/sup mag/, in non-Abelian gauge theory. Necessary conditions for electric and magnetic superconductivity are given by m/sup ele/approx.0 and m/sup mag/approx.0, respectively. Employing a linear response theory, we find that m/sup mag/ is related to a two-point correlation function of field strengths and that the condition m/sup mag/approx.0 can be satisfied in non-Abelian gauge theory