According　to　practical　situation　of　wastewater　treatment　process,　it　turned　nonlinear　model　of　activated　sludge　wastewater　system　into　uncertain　parameters　model.　To　this　model,　it　gave　controllability　and　stability　analysis　and　designed　a　state　feedback　to　improve　its　stability.　A　fuzzy　neural　network　controller　is　proposed　for　this　model,　and　by　means　of　simulation　the　result　shows　that　such　application　is　feasible.　When　compared　with　traditional　fuzzy　control,　this　fuzzy　neural　network　control　strategy　shows　excellent　robust　and　good　dynamic　characteristics　to　control　of　above　uncertain　parameters　system.