Based on recirculating aquaculture mode technological process, combined with nearly years' aquaculture mode scientific research and industrial development, focused on water treatment and application, this paper summarized and discussed big particle filter, ozone disinfection, gas floating comprehensive treatment, biological filter, ultraviolet radiation sterilization, pH adjustment and other aspects of water conditioning respectively, which can provide corresponding reference for impelling the precision and practical water treatment process and establishing the high-end recirculating aquaculture mode for the situation of China in the future.