Mediated cathodic reduction of butyraldehyde and anodic oxidation of furan by paired electrolysis were studied. The effects of the current density, temperature, electrode materials, redox mediator, and reactant concentrations on the current efficiency and power consumption were determined. The main factors which affected the current efficiency of the paired electrolysis were the current density, redox mediator concentration, and electrode material, while the minor factors were the temperature and reactant concentration. The effects of the major and minor factors on the current efficiencies of the main products: 2,5-dimethyoxy-2,5-dihydrofuran, at the anode and butyl alcohol at the cathode, respectively, varied. The highest total current efficiency and the lowest power consumption of paired electrolysis were 155.4% and 2.69 kW(.)h(.)kg(-1), respectively.