Porous ceramics materials as carrier of microorganism, used in the purification of water, was prepared from waste materials such as waste glass, porcelain, earthen ware, volcanic ash and oyster shell. Effective microorganisms were immobilized in ceramic carriers and then artificial waste water was supplied to conduct water purification test. The highest purification performance was achieved by using porous ceramics whose surface potential was strongly negative, which were effective for adhesion of microorganisms onto the ceramics. Much amount of microorganisms immobilized onto ceramic carrier having pores over dozens μm was observed, as microorganisms are several μm in size. All the ceramic carriers were covered by microorganisms after treatment for 10 days. The phosphorus content in water could be reduced by using calcium based ceramics.