Dependences of reactant concentrations and current densities of individual stages on the electrolysis time for a multistage electrode process complicated by the transfer of intermediates between the near-electrode layer and the bulk electrolyte are obtained by numerical computer-aided modeling. Effect of various factors on the dynamics of variations in the concentration of the initial reactant and intermediate in the bulk electrolyte is analyzed. The possibility of a substantial increase in the current efficiency of the second stage of discharge during electrolysis is shown.