The influence of the electrostatic interaction ori the diffusion coefficients of ions is estimated in the approximation of the slightly varying equilibrium potential. Various assumptions have been considered for the fixed charge distribution, namely, the discrete charge distributed in the bulk, the surface charge, and the linear charge distributed around a macroion, Both the random and regular distributions of the fixed charge groups are being separately analyzed as applied to each assumption. Obtained dependencies show in some measure various types of the fixed charge heterogeneity contribute to the effect of the diffusion coefficient decrease.