Hypochlorous acid (HOCl) is a natural human potent fungicide may arise from the body, Its bactericidal concentrations 50 ~ 200 ppm, Much lower than sodium hypochlorite. As such Hypochlorous acid (HOCl) compared with sodium hypochlorite on human security. Less impact on the ingredients, Corrosion of the equipment is low. Hypochlorous acid (HOCl) both practical and low cost characteristics, Developed in this research hypochlorous acid (HOCl) to the water electrolysis apparatus saline (NaCl) as the starting material, Electrolysis of water to generate the free chlorine concentration of 100 ~ 600 ppm, Simple operating conditions And in a short time can generate a lot of sterilization fluid.