A method of producing strong oxidized water using three-cell electrodialysis stack by membrane electrodialysis was proposed.Operating priniciples and processing data were provided,and the selections of composition materials were discussed.Depending on the experiment,the optimal conditions for producing strong oxidized water were obtained,i.e.when the distance of electrode pairs is 10 cm,the concentration of NaCl is 5.32% and the voltage is 32V,the efficiency for producing strong oxidized water with this kind of device is the highest.The relation between operation current density and current efficiency was also discussed.