This　paper　shows　a　new　method　of　fuzzy　network　which　can　change　the　structure　by　the　systems.　This　method　is　based　on　the　self-organizing　mapping　(SOM),　but　this　algorithm　resolves　the　problem　of　the　SOM　which　can＇t　change　the　number　of　the　network　nodes.　This　new　algorithm　can　change　the　number　of　fuzzy　rules,　so　it　takes　the　experienced　rules　out　of　the　necessary,　side　for　the　number　of　the　fuzzy　rides.　We　use　this　new　algorithm　to　control　the　dissolved　oxygenic　in　the　wastewater　treatment　processes.　This　algorithm　can　adjust　subjection　function　on-line,　optimize　control　rules.　The　results　of　simulations　Shou;　that　the　controller　can　take　the　dissolved　oxygenic　to　achieve　the　presumed　request,　and　prove　the　superiority　of　this　algorithm　in　real　time　control.