We created wetland type biotope with recycled water in the industrial open space near the bay coast at Sakai City, Osaka Pref., Japan. We studied structure of vegetation, water quality and inhabits of insects and birds at the biotope. As a result, some species of insects inhabited; such as Ischnura senegalensis and Anax parthenope jilius, by preparing environmental conditions at the biotope. Concentration of nitrogen, phosphorus and potassium in the water flowed out from the pond were less than that of flowing into. Some aquatic insects; I. senegalensi, Crocothemis servilia, A.panhenope jilius, Orthetrum albistylum speciosum, Diplonychus japonicus and so on, inhabited with eutrophication water quality. For example DO was 1.4-7.0mg/l, BOD was 0.5-4.0mg/l, nitrogen was 8.8-25.2mg/l, phosphorus was 1.3-4.0mg/l, and potassium was 13-20mg/l.