[en] The problem of quark confinement in quantum chromodynamics (QCD) from the view point of gauge group center symmetry, is investigated. For this purpose lattice gauge model is considered, where phase transition is connected with spontaneous breaking of the symmetry of the gauge group center. Two-charge QCD, studied by the methods of perturbation theory, is determined. A chain of contour movement equations for a two-charge model is derived, and by means of it the validity of the the factorized formula for loop means is proved. The dependence of the free energy on the external field for multicolour two-charge model coincides with the analogous value in U(1)-gauge theory. The phase diagram is obtained in the multicolour limit, is separates phases with confined and released quarks. Transition in the phase of quark confinement to the continuous Lorentz-invariant limit is briefly discussed